Bayesian–Walrasian equilibria: beyond the rational expectations equilibrium

In general rational expectations equilibrium (REE), as introduced in Radner (Econometrica 47:655–678, 1978) in an Arrow–Debreu–McKenzie setting with uncertainty, does not exist. Moreover, it fails to be fully Pareto optimal and incentive compatible and is also not implementable as a perfect Bayesian equilibrium of an extensive form game (Glycopantis et al. in Econ Theory 26:765–791, 2005). The lack of all the above properties is mainly due to the fact that the agents are supposed to predict the equilibrium market clearing price (as agent’s expected maximized utility is conditioned on the information that equilibrium prices reveal), which leads inevitably to the presumption that agents know all the primitives in the economy, i.e., random initial endowments, random utility functions and private information sets. To get around this problematic equilibrium notion, we introduce a new concept called Bayesian–Walrasian equilibrium (BWE) which has Bayesian features. In particular, agents try to predict the market-clearing prices using Bayesian updating and evaluate their consumption in terms of Bayesian price estimates, which are different for each individual. In this framework agents maximize expected utility conditioned on their own private information about the state of nature, subject to a Bayesian estimated budget constraint. Market clearing is not an intrinsic part of the definition of BWE. However, both in the case of perfect foresight and in the case of symmetric information BWE leads to a statewise market clearing; it then becomes an ex post Walrasian equilibrium allocation. This new BWE exists under standard assumptions, in contrast to the REE. In particular, we show that our new BWE exists in the well-known example in Kreps (J Econ Theory 14:32–43, 1977), where REE fails to exist. This work was done in the Spring of 2005, when EJB was a visiting professor at the University of Illinois.     

Valuing climate protection through willingness to pay for biomass ethanol

This study uses a multi-part, split-sample contingent valuation method (CVM) and fair share (FS) survey to better understand the public's valuation of mitigating global climate change through its willingness to pay for biomass or “cellulosic” ethanol. In addition to a basic CVM question, a related scenario was developed that asked half of the survey respondents to state their fair share cost to lessen a potential food shortage in the next decade, also through the expanded use of cellulosic ethanol. Three alternative biomass feedstocks were assessed: farming residues, forestry residues and paper mill wastes, and municipal solid wastes. Overall a slightly larger proportion of respondents were WTP extra for cellulosic ethanol in the basic CVM scenario than in the FS scenario, though no significant differences were found in the WTP for the different feedstocks. Bid curve lognormal regression results for the two models were similar, supporting the idea that asking a FS rather than a conventional WTP question may be justifiable in some circumstances, such as in cases of a national emergency.     

European Union enlargement: An historic milestone in the process of European integration

Ten European countries with economies in transition and two market economies are negotiating full membership with the European Union. This paper considers the economic dimension of the forthcoming enlargement of the European Union, especially on the characteristics of the economies in transition and on the economic implications of the enlargement for European Union agriculture. The transition of the central and eastern European countries from a centrally planned to a market economy, although already in progress for a decade, is far from complete. Uneven macroeconomic developments in the various countries can be attributed to some extent to their individual situation at the start of the transformation. However, they also reflect the varying extent to which institutional reform programs have been implemented in these countries.Distinguished Address presented at the Fifty-First International Atlantic Economic Conference, March 13–20, 2001, Athens, Greece.     

Stock returns and volatility: Evidence from the Athens Stock market index

This paper investigates the volatility of the Athens Stock excess stock returns over the period 1990–1999 through the comparison of various conditional hetero-skedasticity models. The empirical results indicate that there is significant evidence for asymmetry in stock returns, which is captured by a quadratic GARCH specification model, while there is strong persistence of shocks into volatility.     

International Comparisons of Labour Productivity in Transport and Communications: The US,the UK and Germany

We construct benchmark estimates of labour productivity covering the transport and communications sectors for the US, UK and Germany for 1992 and 1993. The US lead is substantial in rail and trucking, even after adjusting for differences in stage length, but Britain leads in air transport and all three countries have similar productivity levels in local transport. In telecommunications and postal services the US enjoys a large lead over both the UK and Germany. We compare these estimates based on industry data with ones derived from the national accounts and find them similar in communications but not in transport. For 1973–96, and also 1989–96, productivity was growing slower in the US, hence some of the gap has been closed.     

British relative economic decline revisited: The role of competition

This paper examines the role of competition in British productivity performance over the period from the late-nineteenth to the early twenty-first century. A detailed review of the evidence suggests that the weakness of competition from the 1930s to the 1970s undermined productivity growth but since the 1970s stronger competition has been a key ingredient in ending relative economic decline. The productivity implications of the retreat from competition resulted in large part from interactions with idiosyncratic British institutional structures in terms of corporate governance and industrial relations. This account extends familiar insights from cliometrics both analytically and chronologically.     

Foreign Direct Investment Spillovers: Evidence from the British Retail Sector

This paper discusses the impact of foreign‐ownership presence on the productivity performance of British‐owned domestic retailers. In particular, we analyse the existence of productivity spillovers, in the form of knowledge transfer, by using establishment‐level data from the Annual Respondents Database over the period 1997–2003. The results confirm the presence of such spillovers and highlight their positive and significant impact on the productivity of domestic firms, although these spillovers are mostly confined to the region in which foreign subsidiaries locate. There is also evidence that the productivity benefit from regional foreign direct investment spillovers increases with the absorptive capacity of domestic retailers.     

Aid Quality and Donor Rankings

This paper offers new measures of aid quality covering 38 bilateral and multilateral donors, as well as new insights about the robustness and usefulness of such measures. The 2005 Paris Declaration on Aid Effectiveness and the follow-up 2008 Accra Agenda for Action have focused attention on common donor practices that reduce the development impact of aid. Using 18 underlying indicators that capture these practices—derived from the OECD-DAC’s Survey for Monitoring the Paris Declaration, the new AidData database, and the DAC aid tables—the authors construct an overall aid quality index and four coherently defined sub-indexes on aid selectivity, alignment, harmonization, and specialization. Compared with earlier indicators used in donor rankings, this indicator set is more comprehensive and representative of the range of donor practices addressed in the Paris Declaration, improving the validity, reliability, and robustness of rankings. One of the innovations is to increase the validity of the aid quality indicators by adjusting for recipient characteristics, donor aid volumes, and other factors. Despite these improvements in data and methodology, the authors caution against overinterpretation of overall indexes such as these. Alternative plausible assumptions regarding weights or the inclusion of additional indicators can still produce marked shifts in the ranking of some donors, so that small differences in overall rankings are not meaningful. Moreover, because the performance of some donors varies considerably across the four sub-indexes, these sub-indexes may be more useful than the overall index in identifying donors’ relative strengths and weaknesses.     

Higher Education Funding

The expansion of higher education throughout the OECD—andbeyond—is both necessary and desirable. But it is costly,and faces competing imperatives for public spending. Highereducation finance is therefore salient to an extent that isnot yet fully appreciated in all countries, and is also immenselysensitive politically. This paper sets out the core lessonsfor financing higher education deriving from economic theoryand puts them alongside lessons from country experience. TheUK reforms announced in 2004 are assessed against the backdropof those two elements. A concluding section briefly maps outunfinished business.