Does peripheral knowledge complement control? An empirical test in technology outsourcing alliances

While the normative logic for forming technology outsourcing alliances is that such alliances allow outsourcing firms to specialize deeper in their domain of core competence without being distracted by noncore activities, recent empirical studies have reported the puzzling phenomenon of some firms continuing to invest in R&D in domains that are fully outsourced to specialized alliance partners. An underlying—and widely made—assertion that can potentially reconcile this contradiction is that ‘peripheral’ knowledge (specialized knowledge in the domain of outsourced activities) complements control in technology outsourcing alliances. However, this assertion is untested; and empirically testing it is the objective of this research study. Using data from 59 software services outsourcing alliances, we show that such peripheral knowledge and alliance control are imperfect complements: peripheral knowledge complements outcomes‐based formal control but not process‐based control. Thus, outsourcing firms might sometimes need knowledge outside their core domain because such knowledge facilitates effective alliance governance. Our theoretical elaboration and empirical testing of the assumed complementarities between peripheral knowledge and control in technology outsourcing alliances has significant implications for strategy theory and practice, which are also discussed. Copyright © 2007 John Wiley & Sons, Ltd.     

Alliance Concentration in Multinational Companies: Examining Alliance Portfolios,Firm Structure,and Firm Performance

Research summary: This article explores the distribution of alliances across firms' internal structure. Focusing on multinational companies, we examine the impact of alliance portfolio concentration—i.e., the extent to which alliances are concentrated within a limited number of geographic units—on focal firms' performance. Relying on Knowledge‐Based View (KBV) insights, we hypothesize that an increase in alliance portfolio concentration positively influences firm performance and that alliance portfolio size negatively moderates this relationship. Our empirical results enrich the emerging capability perspective on alliance portfolios, point to the relevance of conceptualizing focal firms in alliance portfolio research as polylithic entities instead of monolithic ones, and provide new insights into how firms create value by potentially recombining externally accessed knowledge. Managerial summary: In the setting of multinational companies, we examine whether alliance activities are concentrated in a limited number of subsidiaries or are highly dispersed across multiple subsidiaries. We find that, over time, firms exhibit different patterns in terms of alliance portfolio concentration. In addition, the results show that, for MNCs with a relatively small alliance portfolio, an increase in alliance portfolio concentration is positively related to their financial performance. However, when MNCs' alliance portfolios are relatively large, the relationship between alliance portfolio concentration and firm performance becomes negative. Jointly, these findings suggest that the distribution of alliances across firms' internal structure is an important factor in shaping potential knowledge recombination benefits from alliance portfolios. Copyright © 2017 John Wiley & Sons, Ltd.     

The impact of R&D‐specific factors on the attractiveness of small‐ and medium‐sized enterprises as partners vis‐à‐vis alliance formation in large emerging economies

This study examines the impact of research and development (R&D)‐specific factors in determining the likelihood of small‐ and medium‐sized enterprises (SMEs) from developed countries to be attractive partners vis‐à‐vis forming alliances with SMEs from large emerging economies (LEEs). This study is founded on the knowledge‐accessing theory of alliance formation, which emphasises the higher efficiency gains of knowledge application as opposed to knowledge generation. We extend this theory to SMEs on the basis that smaller firms, because of their resources constraints and drive to survive, are likely to use alliances to access external knowledge bases leading to new product development (NPD) opportunities because of the low feasibility of acquiring knowledge. As a mix of complex knowledge is necessary to develop most modern products and services, SMEs are also likely to adopt a more flexible operational approach and to accept compromises to forge knowledge‐accessing alliances. We illustrate this theoretical development using primary data collected from British and German biotechnology SMEs, declaring the intention prospectively to form alliances with their counterparts in Brazil. Binary logistic regression was used to identify the factors influencing the likelihood of a firm as an attractive alliance partner. Our results indicate that R&D‐specific factors influence the likelihood of firms to be attractive alliance partners. In particular, firms showing an in‐house innovation history focused on one or few products are more likely to be attractive alliance partners with LEE firms than those that do not. Another R&D‐specific predictor that enhances the chances of alliance partner attractiveness with LEE firms is the firm's focused searching and identifying capability relative to technology or equipment that demonstrates good prospects to improve the firm's line of products. A third predictor refers to the firm's awareness regarding non‐cost obstacles for its own technological development. Implications for policy makers and practitioners are also discussed.     

Learning from competing partners: outcomes and durations of scale and link alliances in Europe,North America and Asia

This paper investigates the outcomes and durations of strategic alliances among competing firms, using alliance outcomes as indicators of learning by partner firms. We show that alliance outcomes vary systematically across link and scale alliances. Link alliances are interfirm partnerships to which partners contribute different capabilities, while scale alliances are partnerships to which partners contribute similar capabilities. We find that partners are more likely to reorganize or take over link alliances than scale alliances. By contrast, scale alliances are more likely to continue without material changes. The two types of alliances are equally likely to shut down, at similar ages. These results support the view that link alliances lead to greater levels of learning and capability acquisition between the partners than do scale alliances. Copyright © 2000 John Wiley & Sons, Ltd.     

Learning to collaborate through collaboration: How allying with expert firms influences collaborative innovation within novice firms

Research summary : Strategic alliances have been recognized as a means for firms to learn their partners' proprietary knowledge; such alliances are also valuable opportunities for partner firms to learn tacit organizational routines from their counterparts. We consider how relatively novice technology firms can learn intraorganizational collaborative routines from more experienced alliance partners and then deploy them independently for their own innovative pursuits. We examine the alliance relationships between Eli Lilly & Co. (Lilly), a recognized expert in collaborative innovation, and 55 small biotech partner firms. Using three levels of analysis (firm, patent, and inventor dyad), we find that greater social interaction between the partner firm and Lilly subsequently increases internal collaboration among the partner firm's inventors. Managerial summary : Can collaborating externally advance internal collaboration? Yes. Our research found that collaboration among scientists at small, early‐stage biotechnology firms significantly increased after these firms formed highly interactive R&D alliances with a large pharmaceutical company known for its expertise in such collaboration. It is well known that alliances help new firms learn specific new technologies and commercialize innovations. Our study broadens the scope of potential benefits of alliances. New firms can also learn collaboration techniques, deploying them internally to enhance their own abilities in collaborative innovation. Managers should take this additional benefit into consideration in developing their alliance strategies. Pursuing alliance partners with expertise in collaboration and keeping a high level of mutual interactions with partner firm personnel should be important considerations to extract this value. Copyright © 2015 John Wiley & Sons, Ltd.     

Comment on “fishing for sharks: Partner selection in biopharmaceutical R&D alliances” by diestre and rajagopalan

A recent study of R&D alliances between new biotechnology firms (NBFs) and pharmaceutical firms investigated how NBFs deal with the “swimming with sharks” dilemma involved in allying with firms capable of appropriating value. It concludes that NBFs are less likely to select alliance partners with related expertise because of greater appropriation risk. Based on our experience as NBF managers and a survey of NBF executives, we believe that such situations are uncommon, and that the study more likely shows pharmaceutical firms seeking diversification. Thousands of NBFs seek alliances with the top 100 pharmaceutical firms, and the larger company is much more likely to be the one to select among multiple potential partners. Copyright © 2013 John Wiley & Sons, Ltd.     

Organizing for knowledge generation: internal knowledge networks and the contingent effect of external knowledge sourcing

Research summary : When faced with a new technological paradigm, incumbent firms can opt for internal development and/or external sourcing to obtain the necessary new knowledge. We explain how the effectiveness of external knowledge sourcing depends on the properties of internal knowledge production. We apply a social network lens to delineate interpersonal, intra‐firm knowledge networks and capture the emergence of two important firm‐level properties: the incumbent's internal potential for knowledge recombination and the level of knowledge coordination costs. We rely on firm‐level internal knowledge networks to dynamically track the emergence of these properties across 106 global pharmaceutical companies over a 25‐year time period. We find that a firm's success in developing knowledge in a new technological paradigm using external knowledge sourcing is contingent on these internal knowledge properties . Managerial summary : Incumbent firms in high‐tech industries often face competence‐destroying technological change. In their effort to adapt and develop new knowledge in a novel paradigm, incumbent firms have several corporate strategy options available to them: internal knowledge development and a wide array of external knowledge sourcing strategies, including alliances and acquisitions. In this study, we make an effort to address a critical question: How effective is external knowledge sourcing under different internal knowledge generation regimes? We find that external sourcing strategies are less effective when firms can already internally generate new knowledge or if they have high internal coordination costs. Therefore, when considering external sourcing, managers must carefully weigh the benefits of it vis‐à‐vis its commensurate costs as the benefits of external sourcing may be overstated . Copyright © 2015 John Wiley & Sons, Ltd.     

Those Who Know,Do. Those Who Understand,Teach. Disseminative Capability and Knowledge Transfer in the Automotive Industry

Innovations in the automotive industry are increasingly building on contributions from different technological fields. Correspondingly, firms in this industry more than ever tend to form research and development (R&D) alliances that aim at innovating new products through integrating separate fields and transferring knowledge. While, in symmetrical R&D alliances, each partner intends to ultimately maintain their distinctive and specialized knowledge base, overlapping knowledge facilitates cooperation and ultimately alliance success. Thus, the capability for knowledge transfer between partners is crucial in such R&D alliances. The literature provides ample evidence that such knowledge transfer is more likely to succeed if the recipient firm has absorptive capability. However, whereas the characteristics of the knowledge transfer process and the recipient firm are well understood, limited attention has so far been given to the issue of the knowledge source firm's ability to transfer knowledge to R&D alliance partners. This study focuses on the impact of source firm capability on successful knowledge transfer in R&D alliances. The study develops a theoretical framework of disseminative capability consisting of five dimensions and tests it on a sample of 59 projects in R&D alliances in the automotive industry. To ensure content validity and avoid common source bias, data were collected from both alliance partners. To test the hypotheses, multiple regression analyses were performed. The results reveal that the source firm's disseminative capability including the attainment of expert knowledge, assessing the recipient firm's knowledge base, and encoding knowledge are positively related to knowledge transfer success, while, surprisingly, detaching knowledge and support of knowledge application in the recipient firm are negatively related. Intentionally or unintentionally, disseminating knowledge across firm boundaries is widely perceived as detrimental to a firm's competitive advantage. Accordingly, the literature tends to downplay disseminative capability as an important means of exploiting external knowledge in collaborative settings. By demonstrating potential benefits for the source firm to transfer knowledge to the allying R&D partner firm, this paper reinvigorates the collaborative dimension in knowledge transfer. Further, the paper is the first of this kind to theoretically explain and empirically show that dimensions of disseminative capability of collaborators in R&D alliances are important for knowledge transfer, whereas disseminative capability is the complementary inverse of an organization's absorptive capacity.     

Technology alliances in emerging economies: persistence and interrelation in European firms' alliance formation

We analyse the patterns and determinants of technology alliance formation with partner firms from emerging economies with a focus on European firms' alliance strategies. We examine to what extent European firms' alliance formation with partners based in emerging economies is persistent – that is, to what extent prior collaborative experience determines new alliance formation – and we compare this pattern with alliance formation with developed country partners. Second, we examine to what extent prior engagement in international alliances with partners from developed countries increases the propensity to form technology alliances with partners based in emerging economies, and vice versa (interrelation). We find that both persistence and interrelation effects are present, and that they are generally not weaker for emerging economy alliances. Alliance formation with Indian and Chinese firms is significantly more likely if firms have prior alliance experience with Japanese firms. The findings suggest that building on their prior international alliance experience firms extend their alliance portfolios across both developed and emerging economies, increasing the geographical diversity of their alliance portfolios.     

Free‐riding in multi‐party alliances: The role of perceived alliance effectiveness and peers' collaboration in a research consortium

Research summary : Multi‐party alliances rely on partners' willingness to commit and pool their efforts in joint endeavors. However, partners face the dilemma of how much to commit to the alliance. We shed light on this issue by analyzing the relationship between partners' free‐riding—defined as their effort‐withholding—and their perceptions of alliance effectiveness and peers' collaboration. Specifically, we posit a U‐shaped relationship between partners' subjective evaluations of alliance effectiveness and their free‐riding. We also hypothesize a negative relation between partners' perceptions of the collaboration of peer organizations and their free‐riding. Results from a mixed‐method study—combining regression analysis of primary data on a major inter‐organizational research consortium and evidence from two experimental designs—support our hypotheses, bearing implications for the multi‐party alliances literature. Managerial summary : Free‐riding is a major concern in multi‐party alliances such as large research consortia, since the performance of these governance forms hinges on the joint contribution of multiple partners that often operate according to different logics (e.g., universities, firms, and government agencies). We show that, in such alliances, partners' perceptions have relevant implications for their willingness to contribute to the consortium's shared goals. Specifically, we find that partners free‐ride more—that is, contribute less—when they perceive the effectiveness of the overall alliance to be either very low or very high. Partners also gauge their commitment to the alliance on the perception of the effort of their peers—that is, other organizations similar to them. These findings provide managers of multi‐party alliances with additional levers to motivate partners to contribute fairly to such joint endeavor. Copyright © 2015 John Wiley & Sons, Ltd.     

Interorganizational alliances and the performance of firms: a study of growth and innovation rates in a high‐technology industry

This paper investigates the relationship between intercorporate technology alliances and firm performance. It argues that alliances are access relationships, and therefore that the advantages which a focal firm derives from a portfolio of strategic coalitions depend upon the resource profiles of its alliance partners. In particular, large firms and those that possess leading‐edge technological resources are posited to be the most valuable associates. The paper also argues that alliances are both pathways for the exchange of resources and signals that convey social status and recognition. Particularly when one of the firms in an alliance is a young or small organization or, more generally, an organization of equivocal quality, alliances can act as endorsements: they build public confidence in the value of an organization's products and services and thereby facilitate the firm's efforts to attract customers and other corporate partners. The findings from models of sales growth and innovation rates in a large sample of semiconductor producers confirm that organizations with large and innovative alliance partners perform better than otherwise comparable firms that lack such partners. Consistent with the status‐transfer arguments, the findings also demonstrate that young and small firms benefit more from large and innovative strategic alliance partners than do old and large organizations. Copyright © 2000 John Wiley & Sons, Ltd.     

Old technology meets new technology: complementarities,similarities, and alliance formation

Alliance formation is commonplace in many high‐technology industries experiencing radical technological change, where established firms use alliances with new entrants to adapt to technological change, while new entrants benefit from the ability of established players to commercialize the new technology. Despite the prevalence of these alliances, we know little about how these firms choose to ally with specific firms given the range of possible partners they may choose from. This study explores factors that lead to alliance formation between pharmaceutical and biotechnology companies. We focus on the alliance tie as the unit of analysis and argue that dyadic complementarities and similarities directly influence alliance formation. We then introduce a contingency model in which the positive effect of complementarities and similarities on alliance formation is moderated by the age of the new technology firm. We draw theoretical attention to the intersection between levels of analysis, in particular, the intersection between dyadic and firm‐level constructs. We find that a pharmaceutical and a biotechnology firm are more likely to enter an alliance based on complementarities when the biotechnology firm is younger. Another noteworthy finding is that proxies for broad capabilities appear to be at least as effective, if not more so, in predicting alliance formation compared to fine‐grained science and technology‐related indicators, like patent cross‐citations or patent common citations. We conclude by suggesting that future studies on alliance formation need to take into account interactions across levels; for example, how dyadic capabilities interact with firm‐level factors, and the advantages and disadvantages of more or less fine‐grained measures of organizational capabilities. Copyright © 2007 John Wiley & Sons, Ltd.     

Alliance portfolio reconfiguration following a technological discontinuity

Research summary : We study how technological discontinuities generate first‐ and second‐order effects on alliance formation and termination, leading to reconfiguration of firms' alliance portfolios. Following technological shocks, we argue that firms often seek alliances that provide new resources while also having incentives to form alliances for reinforced and challenged resources that complement the new resources. In parallel, alliance terminations, even involving resources otherwise unaffected by the discontinuity, increase due to limits in firms' alliance carrying capacity. We study biopharmaceutical firms between 1990 and 2000, which faced a technological discontinuity in 1995 in the form of combinatorial chemistry and high‐throughput screening. We improve understanding of how technological discontinuities affect the value of resources and how firms reconfigure alliance portfolios in response. Managerial summary : When firms form alliances to gain new resources during technological discontinuities that disrupt their industry, they cannot consider only the focal new partnerships. Instead, new alliances create complementarity and substitution pressures that lead to broader reconfiguration of the firms' alliance portfolios: (1) complementarity creates incentives to also form alliances for resources that the technological discontinuity reinforces or challenges in order to improve the collective value of co‐specialized assets; (2) substitution creates incentives to terminate existing alliances, even if their value is otherwise unaffected by the discontinuity, in order to create carrying capacity for new alliances. Thus, one new alliance can generate a cascade of reconfiguration that challenges the balance between the benefits of stability and the need for change in an alliance portfolio. Copyright © 2016 John Wiley & Sons, Ltd.     

Ambiguity and the process of knowledge transfer in strategic alliances

This research examines the role played by the ‘causally ambiguous’ nature of knowledge in the process of knowledge transfer between strategic alliance partners. Based on a cross‐sectional sample of 147 multinationals and a structural equation methodology, this study empirically investigates the simultaneous effects of knowledge ambiguity and its antecedents—tacitness, asset specificity, prior experience, complexity, partner protectiveness, cultural distance, and organizational distance—on technological knowledge transfer. In contrast to past research that generally assumed a direct relation between these explanatory variables and transfer outcomes, this study’s findings highlight the critical role played by knowledge ambiguity as a full mediator of tacitness, prior experience, complexity, cultural distance, and organizational distance on knowledge transfer. These significant effects are further found to be moderated by the firm’s level of collaborative know‐how, its learning capacity, and the duration of the alliance. Copyright © 1999 John Wiley & Sons, Ltd.     

Incubation of an industry: Heterogeneous knowledge bases and modes of value capture

Research summary : We examine firms' technological investments during an industry's incubation stage—the period between a technological breakthrough and the first instance of its commercialization. Using the agricultural biotechnology context, we develop stylized findings regarding the understudied knowledge evolution preceding product evolution in an industry's life cycle, the trend and diversity of firms undertaking technological investments in anticipation of industry emergence, their leverage of markets for technology and corporate control, and their use of alternative modes of value capture. We juxtapose these stylized findings with existing literature to identify new theoretical insights, and set the stage for future scholarly work to develop and test new theories for the incubation period, examine its existence in other industries, and study its impact on subsequent firm and industry evolution. M anagerial summary : New technological breakthroughs present managers of existing firms and aspiring entrepreneurs with opportunities to create altogether new industries. During the vibrant incubation period, we find that multiple firms capitalize on diverse knowledge bases to shape the industry's knowledge evolution and also capture economic value in diverse ways. Existing firms in the obsolescing industry are more likely to become targets in acquisitions given their complementary knowledge. Science‐based start‐ups are more likely to engage in acquisitions and collaborations with established firms. Diversifying firms are more likely to commercialize products after leveraging of internal development, acquisitions, and alliances. Our study highlights the importance for managers to think about “success” and “failure” across multiple yardsticks of performance, rather than only as product commercialization as the sole goal. Copyright © 2016 John Wiley & Sons, Ltd.     

How does the partner type in R&D alliances impact technological innovation performance? A study on the Korean biotechnology industry

The number of strategic alliances for R&D activities in the biotechnology industry is sharply increasing. Some studies show that each alliance partner type has different alliance motives, resources and capabilities, organizational structures and cultures, and degrees of competition with partners, which can lead to different performances of strategic alliances. In this regard, this study conducts an empirical analysis of the different impact of each type of alliance partner on technological innovation performance and finds the moderating effect of absorptive capacity and potential competition by categorizing strategic alliances for R&D activities in the biotechnology industry into three types: vertical-downstream alliances, vertical-upstream alliances, and horizontal alliances. This study analyzed 206 Korean biotechnology firms and their strategic alliances for a total of 292 R&D activities. The results of the analysis showed that vertical alliances have a positive impact on technological innovation performance, while horizontal alliances have an inverted U-shaped relationship with technological innovation performance caused by the effect of competition. Additionally, it was confirmed that the R&D intensity of biotechnology firms has a moderating effect of increasing the impact of vertical-upstream alliances on technological innovation performance.     

An examination of the effects of venture capitalists on the alliance formation activity of entrepreneurial firms

Research Summary : Alliances offer benefits such as access to capital, knowledge, and markets. Yet, due to their lack of legitimacy, entrepreneurial firms find it challenging to engage in alliances. Thus, it is important to examine which factors may drive alliance formation for entrepreneurial firms. We examine whether the presence of venture capitalists (VCs) is such a factor. Whereas current research suffers from endogeneity concerns that make the comparison of VC- and non-VC-backed firms problematic, our empirical design reduces this problem. Overall, we find that the presence of a VC and a VC's experience with taking firms public are positively associated with entrepreneurial firms’ alliance formation, and that VCs are more active in forming an alliance when the exit outcome is an acquisition, rather than going public. Managerial Summary : Alliances can be of fundamental importance to the growth of entrepreneurial firms. However, because entrepreneurial firms hold limited resources, their access to alliances may be limited. We study whether entrepreneurial firms backed by venture capitalists (VCs) are more likely to enter into alliances than firms without VC backing. A major problem with this sort of analysis is that VCs may cherry pick the best firms, which in turn are more likely to engage in alliances to begin with, irrespective of VCs. Accordingly, we control for the quality of funded firms, and therefore, isolate the VCs’ contribution to alliance formation. In doing so, we find support for the importance of the role VCs play in entrepreneurial firms’ alliance formations.     

How Central Is Too Central? Organizing Interorganizational Collaboration Networks for Breakthrough Innovation

Firms increasingly look to collaboration with alliance partners in their quest for breakthrough innovation. But how does the position of a firm in its alliance network weighted by the centrality of its partners—a concept which we term “partner‐weighted alliance centrality”—and the heterogeneities in the types of partners that it cooperates with—in terms of its private‐public collaboration—influence this quest? Using longitudinal data from the U.S. pharmaceutical industry, we build alliance networks in the period 1985–2001 to investigate these questions. We show that, for breakthrough innovation, collaborating with more partners that are more central in alliance networks the better, but only to a point. Beyond that point, we find that the likelihood of achieving breakthrough innovation drops. Furthermore, and looking at the kinds of knowledge provided by the partners in each firm's alliances, we report that firms with a greater share of private partners, relative to public partners, suffer less from the diminishing benefits of collaboration with central partners when developing breakthrough innovation. Taken together, we make novel contributions about how to organize for breakthrough innovation, and provide actionable managerial advice in terms of selecting collaborative partners in alliance networks.     

Knowledge sharing and safeguarding in R&D collaborations: The role of steering committees in biotechnology alliances

Research Summary: This research contributes to alliance governance research by demonstrating how partners' administrative controls in nonequity collaborations regulate knowledge transfers across partners. These administrative controls can take the form of board‐like joint committees having explicitly delineated authority over certain alliance activities. We illuminate governing committees as an important, albeit neglected, instrument for administrative control in the governance of non‐equity alliances, and we demonstrate that these organizational mechanisms facilitate knowledge flows within the scope of an alliance. We also show that governing committees safeguard against misappropriation hazards, particularly when a partner possesses the incentive and ability to engage in such behavior. This study extends alliance governance research beyond the implications of the equity‐nonequity dichotomy to consider a wider and richer gamut of governance instruments available to address the challenges associated with knowledge transfers in alliances. Managerial Summary: Non‐equity alliances are important vehicles to collaborate with external partners, particularly in the biopharmaceutical industry and other high‐tech sectors. To guide these collaborations effectively, partners can use the contract to custom‐build jointly‐staffed managerial units with clearly demarcated decision‐making responsibilities. We demonstrate that these organizational mechanisms facilitate knowledge flows within the scope of an alliance. We also show that governing committees also safeguard against misappropriation hazards, particularly when a partner values a firm's knowledge highly, or it possesses the required ability to absorb and assimilate a firm's knowledge. Our results imply that contractually‐defined managerial interfaces provide a channel to regulate knowledge‐sharing in collaborative alliances.     

Ties' repeatedness,partners' social value,and alliance portfolio performance in emerging economy: The moderating roles of firm-government linkages

Repeatedly collaborating with previous partners or following peers' decisions are two primary strategies employed by emerging economy firms in selecting their alliance partners. As a result, the alliance portfolios of firms often feature a high level of ties' repeatedness and partners' social value—the extensiveness of a firm's partners being selected by other players in the industry. However, few studies examine whether these two features can result in superior alliance portfolio performance. Leveraging data collected from 566 fund product distribution alliances initiated by 62 fund companies in a 5-year period (2007–2011), we find that ties' repeatedness does not significantly improve alliance portfolio performance. In fact, a high level of social value of the current partners produces a negative effect. However, firms' linkages to governments can change the performance consequences of these two features. As a category of formal government–firm linkages, state ownership improves the positive effect of ties' repeatedness on alliance portfolio performance, while it strengthens the negative effect of partners' social value. As a category of informal linkages, political ties weaken the positive effect of ties' repeatedness on alliance portfolio performance but cannot significantly alleviate the negative effect of the social value of current partners.