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Many arguments about decentralization in public goods provision have testable implications for the relationship between decentralization and the level and spatial variability of public goods. This paper explores the empirical relationship between decentralization and environmental public good, water quality in rivers at monitoring stations around the world. It examines pollution levels and spatial variability of pollution within a country for both a local and a regional pollutant. The results suggest higher pollution levels with greater decentralization when fixed effects are included; the evidence is strongest for the regional pollutant, where it might result from interjurisdictional free riding. Federalism is associated with greater spatial variability in pollution within a country, consistent with the traditional view that decentralization allows policies more tailored to local conditions.

In this paper, we construct a parsimonious overlapping generations model of human capital accumulation, and study its quantitative implications for the evolution of the U.S. wage distribution from 1970 to 2000. One of the key features of the model is that individuals differ in their ability to accumulate human capital, which is the main source of wage inequality in this model. We examine the response of this model to skill-biased technical change (SBTC), which is modeled as an increase in the trend growth rate of the price of human capital starting in early 1970's. Due to the heterogeneity in ability and age, the responses of different individuals to SBTC are systematically different from each other, generating rich behavior in the evolution of relative wages. We consider different scenarios regarding how individuals' expectations evolve during SBTC. Specifically, we study the case where individuals immediately realize the advent of SBTC (perfect foresight); and the case where they initially underestimate the future growth of the price of human capital (pessimistic priors), but learn the truth in a Bayesian fashion over time. Lack of perfect foresight appears to have little effect on the main results of the paper. The model is quantitatively consistent with several trends including the rise in overall wage inequality; the fall and rise in the college premium; the rise in within-group inequality; the stagnation in median wage growth, and the small rise in consumption inequality despite the large rise in wage inequality. Overall, the model shows promise for explaining disparate trends in the evolution of the wage distribution in a unifying human capital framework.

Seesemann, Rüdiger: Between Sufism and Islamism: the Tijaniyya and Islamist rule in the Sudan. - S. 23-57 Loimeier, Roman: Sufis and politics in sub-Saharan Africa. - S. 59-101 Pinto, Paulo: Sufism and the political economy of morality in Syria. - S. 103-136 Paul, Jürgen: Solitude within society: early Khwajagani attitudes toward spiritual and social life. - S. 137-163 Ocak, Ahmet Yaşar: Sufi milieux and political authority in Turkish history: a general overview (thirteenth-seventeenth centuries). - S. 165-195

The paper examines the robustness of Interest Rate Rules, IRRs, in the context of an imperfectly credible stabilization program, closely following the format of much of the literature in open-economy models, e.g., Calvo and Végh (1993 and 1999). A basic result is that IRRs, like Exchange Rate Based Stabilization, ERBS, programs, could give rise to macroeconomic distortion, e.g., underutilization of capacity and real exchange rate misalignment. However, while under imperfect credibility EBRS is associated with overheating and current account deficits, IRRs give rise to somewhat opposite results. Moreover, the paper shows that popular policies to counteract misalignment, like Strategic Foreign Exchange Market Intervention or Controls on International Capital Mobility may not be effective or could even become counterproductive. The bottom line is that the greater exchange rate flexibility granted by IRRs is by far not a sure shot against the macroeconomic costs infringed by imperfect credibility.