Dismantling terrorist networks: Evaluating strategic options using agent-based modeling

Dismantling dark networks remains a critical goal for the peace and security of our society. Terrorist networks are the most prominent instantiation of dark networks, and they are alive and well. Attempts to preemptively disrupt these networks and their activities have met with both success and failure. In this paper, we examine the impacts of four common strategies for dismantling terrorist networks. The four strategies are: leader-focused, grassroots, geographic, and random. Each of these strategies has associated pros and cons, and each has different impacts on the structure and capabilities of a terrorist network. Employing a computational experimentation methodology, we simulate a terrorist network and test the effects of each strategy on the resiliency of that network. In addition, we test scenarios in which the terrorist network has (or does not have) information about an impending attack. Our work takes a structural perspective to the challenge of addressing terrorist networks. Specifically, we show how various strategies impact the structure of the network in terms of its resiliency and capacity to carry out future attacks. This paper also provides a valuable overview of how to use agent-based modeling for the study of complex problems in the terrorism, conflict studies, and security study domains.     

DO PERCEPTIONS BECOME REALITY? THE MODERATING ROLE OF SUPPLY CHAIN RESILIENCY ON DISRUPTION OCCURRENCE

The concern and study of supply risk and supply continuity has recently come to the forefront in managing business and conducting research. This empirical study of U.S. and German firms investigates the relationship between perceived supply risk sources and supply disruption occurrence, as well as the use of supply chain resiliency practices to reduce disruption frequency. We demonstrate that supply managers' concerns with risk emanating from suppliers and the supply market are positively related to supply disruption occurrence. We further show how and when implementing flexibility and redundancy may reduce the effects of supply disruptions.     

Impact of MiFID II tick-size regime on equity markets—Evidence from the LSE

This study investigates the impact of MiFID II on the London Stock Exchange. We find that a tick-size reduction leads to lower bid–ask spreads, lower trade values, reduced cost of trading at and beyond the best bid-offer, an acceleration of quote updates, an increase in aggressive trades and a reduction in price impact. Increased tick size widens spreads and increases trading costs. Step functions reveal that liquidity adjusts opposite to the tick change. To determine if impacts are proportional, we identify potential functions that predict cost changes with tick updates, implying that traders adjust their trade sizes according to the new tick levels.     

Managing supply chain resilience to pursue business and environmental strategies

Resilience has become a crucial topic in the field of strategic management as it requires companies to design resilient business models to tackle managerial and environmental disruptions of individual firms and supply chains. However, extant research still lacks deep insights into how companies design and manage supply chains according to the resilience principles. With this premise, this paper aims at conducting a state of the art review on supply chain resilience (SCR) considering 125 relevant papers collected from Scopus and Web of Science academic search engine. Starting from the results of the literature review, this study proposes a systemic framework of SCR assessment and contributes to improve the understanding of the impact of different empirically tested constructs on the development of the resilience concept. Further, the findings are summarized in several areas including barriers in developing resilience, metrics to measure the resilience performance, and effective strategies to foster the SCR. Finally, this study outlines promising future research directions for scholars and practitioners.     

Problem-Based solutions from the classroom to the Community: Transformative approaches to mitigate the impacts of boom-and-bust in declining urban communities

Strategic partnerships between universities and declining urban neighborhoods with limited resources have resulted in some innovative and forward-thinking approaches to land use and planning. These approaches respond to the impacts of boom-and-bust through the implementation of problem-based solutions and have spurred development to make communities more resilient. The university-community partnerships and engagements have multiple goals, including increasing university responsiveness to local needs, stimulating real-world change, and preparing students to effectively address complex social challenges (Dorado and Giles, 2004). However, such approaches are complicated by a variety of factors, including stakeholder expectations, power imbalances, and the conflicting goals of educators and community members (Mansuri and Rao, 2004). While the benefits of service-learning programs to universities are well documented, the benefits of such higher education partnerships to community participants are not as well known (Netshandama, 2010). Successful engagements seem to require community involvement and decision-making authority at every phase, mutual accountability, and trust (Winkler, 2013). This paper refers to a series of case studies of community engagement and neighborhood empowerment that involved the development of a collective sustainable plan/vision for declining inner-city neighborhoods with limited resources. This participatory form of local community development combines and goes beyond spatial planning and land use tools to demonstrate in some depth how an “inside the neighborhood” approach can make communities less vulnerable to boom-and-bust cycles. These neighborhoods, located in Columbus, Ohio, have seen tremendous declines in population and economy over the past years because of significant losses in manufacturing jobs. The case studies can inspire communities and demonstrate that service learning has the potential to provide communities with place-specific guidelines and recommendations that improve the quality of life for residents; but their implementation requires a collective effort that goes beyond the classroom.     

An Empirically Derived Framework of Global Supply Resiliency

In today’s global business environment, supply chains have increased in both length and complexity. This increase in length and complexity coupled with a focus on improving efficiency, such as lean manufacturing practices, may lead to higher levels of supply chain risk where the likelihood of a disruption severely impacting supply chain performance increases. Resilient supply chains have been touted as a means to reduce the likelihood and severity of supply chain disruptions. However, there is little empirical evidence relative to the factors that contribute to or detract from supply resiliency. Using systems theory and the resource‐based view of the firm as the theoretical underpinnings, this study provides an in‐depth systematic investigation of supply resiliency. Adopting a theory‐building approach based on a multi‐industry empirical investigation, this study derives empirical generalizations linking 19 supply chain characteristics to supply resiliency. The study culminates in a framework that could be used to assess the level of resiliency in a supply base. Building on this framework, the study also provides a supply resiliency matrix that can be utilized to classify supply chains, or supply chains segments according to the level of resiliency realized. This article concludes by proposing several future research directions and issues that may be investigated in more detail.     

Inherent factors of family business and transgenerational influencing tourism business in Malaysian islands

ABSTRACT

There is an indication that the existence of transgeneration enterprise has unique ability as a ‘resilient factor’ in sustainable tourism development. It bridges the relationship between resilience and sustainability. This paper highlight evidences of the relationship using two successful case studies of Small-Medium scale tourism enterprises on the islands in Malaysia, namely the islands of Langkawi and Tioman. The most important factors influencing successful family business in transgeneration enterprise by priority within the business wealth point of view are aspect of survival, followed by low-entry barriers, ‘passing the baton’, bridging relationship, ‘smallness’, and adapt and change. From the socioemotional wealth point of view, aspect of belonging followed by family welfare priorities, structural generation change, contextual embeddedness, attitude, informal decision making and friendly working environment influence the success of family business in transgeneration enterprises. Hence, sustainable tourism development in the context of local community empowerment might only be achieved once the ‘resilient factor’ is present or in place and ready at the tourism destination.     

Resiliency in the E-mini futures market

We study how quickly liquidity is replenished on the order book in E-mini futures. The results show that participants who use patient methods, such as limit orders, are often fast to place new orders, while those using impatient market orders are slow to re-enter the market. These delays are a function of state constants, such as firm types, state conditions, such as whether the order is price improving, and time-varying covariates, such as the volume of trade during the gap. We also find support for the view that certain traders delay providing liquidity during active markets to avoid informed trading.     

The impact of aggressive orders in an order-driven market: a simulation approach

This article investigates resiliency in an order-driven market. On basis of a vector autoregressive model capturing various dimensions of liquidity and their interactions, I simulate the effect of a large liquidity shock, measured by a very aggressive market order. I show that, despite the absence of market makers, the market is resilient. All dimensions of liquidity (spread, depth at the best prices and order book imbalances) revert to their steady-state values within 15 orders after the shock. For prices, a long run effect is found. Furthermore, different dimensions of liquidity interact. Immediately after a liquidity shock, the spread becomes wider than in the steady state, implying that one dimension of liquidity deteriorates, while at the same time, depth at the best prices increases, meaning an improvement of another liquidity dimension. In subsequent periods, the spread reverts back to the steady-state level but also depth decreases. Also, I find evidence for asymmetries in the impact of shocks on the ask and bid side. Shocks on the ask side have a stronger impact than shocks on the bid side. Finally, resiliency is higher for less-frequently traded stocks and stocks with a larger relative tick size.