Challenges for land system science

While considerable progress has been made in understanding land use change, land system science continues to face a number of grand challenges. This paper discusses these challenges with a focus on empirical land system studies, land system modelling and the analysis of future visions of land system change. Contemporary landscapes are contingent outcomes of past and present patterns, processes and decisions. Thus, empirical analysis of past and present land-use change has an important role in providing insights into the socio-economic and ecological processes that shape land use transitions. This is especially important with respect to gradual versus rapid land system dynamics and in understanding changes in land use intensity. Combining the strengths of empirical analysis with multi-scale modelling will lead to new insights into the processes driving land system change. New modelling methods that combine complex systems thinking at a local level with macro-level economic analysis of the land system would reconcile the multi-scale dynamics currently encapsulated in bottom-up and top-down modelling approaches. Developments in land use futures analysis could focus on integrating explorative scenarios that reflect possible outcomes with normative visions that identify desired outcomes. Such an approach would benefit from the broad and in-depth involvement of stakeholders in order to link scientific findings to political and societal decision-making culminating in a set of key choices and consequences. Land system models have an important role in supporting future land use policy, but model outputs require scientific interpretation rather than being presented as predictions. The future of land system science is strongly dependent on the research community's capacity to bring together the elements of research discussed in the paper, via empirical data collection and analysis of observed processes, computer simulation across scale levels and futures analysis of alternative, normative visions through stakeholder engagement.     

Travelling to the Ancestral Homelands: The Aspirations and Experiences of a UK Caribbean Community

This paper is based on an ethnographic study of the Caribbean community of Moss Side, Manchester (UK). Its aim is to reveal, interpret and analyse the personal meanings which members of the community attach to visiting the ancestral homeland in the Caribbean. This form of travel is defined in terms of 'ethnic reunion', which involves travelling for the purpose of visiting friends and relatives and/or searching for one's cultural roots. The study, which is based on an interpretive analysis of a range of ethnographic material, initially examines the reasons why first- and second-generation Caribbeans wish to participate in the 'homeland experience', and then illustrates ways in which they reconstruct an identity of themselves through their travel perceptions and experiences. The latter part of the paper discusses how people's travel encounters serve to illustrate how ethnic differences and boundaries between groups are constructed and/or reconstructed. It is argued that established perspectives of tourism motivation and behaviour do not fully account for the role of ethnicity as a significant variable in influencing specific forms of travel. The conclusion asserts that ethnic reunion should be conceptually viewed as a distinct form of 'travel', socioculturally dissimilar to conventional forms of 'tourism'.     

Entry Solicitation and Deterrence in R&D Competition with Spillovers

The purpose of this note is to examine incumbent behaviour and patterns of entry under R&D competition with spillovers. We find that, in addition to blockading, deterring and accommodating entry, the incumbent may also solicit entry. Entry solicitation occurs when the incumbent strategically alters its R&D commitment in order to take advantage of the spillover generated by the entrant's subsequent R&D investment. Although our results are placed in the context of R&D with spillovers, they are applicable to a wider class of models involving positive externalities, particularly network externalities.
JEL Classification Numbers: L12, O31.     

Clarence Ayres’s Critique of Orthodox Economic Theory

Mainstream economists and liberal politicians are criticizing the Third Way as it is being applied in the Netherlands. They argue that mutual consultation precludes an efficient adaptation to disturbances. The present study analyzes changes in wage and income policy in the Netherlands until 2005. It finds that wage and income policy has proven to be flexible enough to address “new” challenges in the Netherlands. The flexibility is rooted in a culture of tolerance that allows for some breaking of working rules. The latter arises from bounded socialization, that is, the imperfect transmission of information with respect to social working rules that result in similar but not identical copies of institutions.     

Executive Compensation: A Model of Disclosure Choice

Recent public policy debates have led to increased calls for full transparency of executive compensation. However, in practice, many firms are reluctant to disclose the full details of how they link executive compensation to performance. One possible reason for lack of full disclosure is that managers use their power to hide the details of their compensation plan in order to disguise opportunistic rent extraction. If this is the reason for secrecy, then public policy designed to force firms to provide full disclosure is unlikely to be resisted by shareholders. However, another possible explanation for less than full transparency is that some degree of secrecy about executive compensation may be in the interest of the company and its shareholders. If this explanation is correct, then public policy moves to increase transparency may be met by counter moves designed to protect managers and shareholders from such policies. In this paper we investigate if full disclosure of executive compensation arrangements is always optimal for shareholders. We develop a model where optimal executive remuneration solves a moral hazard problem. However, the degree to which the moral hazard problem affects the shareholders depends on hidden information, so that disclosure of the executive compensation scheme will typically reveal the hidden information, which can be harmful to shareholders. The model derives, therefore, the optimal disclosure policy and the optimal remuneration scheme. We find that the shareholders are better off pre‐committing not to disclose the executive compensation scheme whenever possible. Executive directors are shown to be better off too in the absence of disclosure of executive compensation schemes. An argument for mandating disclosure is that it provides better information to shareholders but our analysis demonstrates that disclosure does not necessarily achieve this objective. The results suggest that less than full disclosure can be in the interest of shareholders, the reason for this being that disclosures cannot be made selectively to shareholders but will also be made to strategic opponents. This will be the case if the board of directors and the remuneration committee includes enough independent directors. Whether or not non‐disclosure to shareholders is in their interest is however an empirical matter involving a trade‐off between the proprietary costs associated with disclosure to shareholders and the costs of potential collusion between executive and non‐executive directors associated with non‐disclosure.     

Production Externalities and Urban Configuration

We formally explore Jacobs' idea that uncompensated knowledge spillovers are crucial for agglomeration by modeling location-dependent interfirm production externalities in a general-equilibrium linear-city framework. Good and factor allocation, firms' and households' locational choice, and wages and land rents are all endogenously determined. The unique equilibrium urban configuration may be concentrated (with monocentric firm locations), dispersed (with completely mixed firm/household locations), or a combination, depending on the population of firms, transportation cost, and firm-interaction parameters. Due to distance-dependent production externalities, firms will be clustered together in any equilibrium, thus ruling out the possibility of any multicentric urban configuration. Journal of Economic Literature Classification Numbers: D51, R12.     

CONSISTENT ESTIMATION OF RESIDUAL VARIANCE IN REGULATORY EVENT STUDIES

This study presents new evidence on alternative methods used to test for abnormal returns in regulatory event studies where cross-sectional correlation in residuals is significant. Results contradict earlier studies that find no advantages to using joint generalized least squares (JGLS) methods over ordinary least squares (OLS). We find that in an actual regulatory event study cross-correlation is significant, and that failing to correct for this correlation results in substantially higher calculated F-statistics. In Monte Carlo simulations we find that OLS test statistics are not well specified when residuals exhibit cross-sectional correlation at levels that are reasonable to expect in daily return data, while JGLS test statistics are well specified. The study includes tests of the effective power of the OLS and JGLS statistics.     

A characterization of the demand for land

In a model of an economy where land is modelled explicitly as heterogeneous subsets of the plane and utility takes an integral form, demand can be characterized as a specific map from endowments and prices into subsets of the plane. A modified form of the Neyman-Pearson lemma is used to obtain this result, the modification being necessary because the analog of randomized tests must be excluded from this model.