March 1998 Differences in interest margins reflect differences in bank characteristics, macroeconomic conditions, existing financial structure and taxation, regulation, and other institutional factors. Using bank data for 80 countries for 1988-95, Demirgüç-Kunt and Huizinga show that differences in interest margins and bank profitability reflect various determinants: * Bank characteristics. * Macroeconomic conditions. * Explicit and implicit bank taxes. * Regulation of deposit insurance. * General financial structure. * Several underlying legal and institutional indicators. Controlling for differences in bank activity, leverage, and the macroeconomic environment, they find (among other things) that: * Banks in countries with a more competitive banking sector-where banking assets constitute a larger share of GDP-have smaller margins and are less profitable. The bank concentration ratio also affects bank profitability; larger banks tend to have higher margins. * Well-capitalized banks have higher net interest margins and are more profitable. This is consistent with the fact that banks with higher capital ratios have a lower cost of funding because of lower prospective bankruptcy costs. * Differences in a bank's activity mix affect spread and profitability. Banks with relatively high noninterest-earning assets are less profitable. Also, banks that rely largely on deposits for their funding are less profitable, as deposits require more branching and other expenses. Similarly, variations in overhead and other operating costs are reflected in variations in bank interest margins, as banks pass their operating costs (including the corporate tax burden) on to their depositors and lenders. * In developing countries foreign banks have greater margins and profits than domestic banks. In industrial countries, the opposite is true. * Macroeconomic factors also explain variation in interest margins. Inflation is associated with higher realized interest margins and greater profitability. Inflation brings higher costs-more transactions and generally more extensive branch networks-and also more income from bank float. Bank income increases more with inflation than bank costs do. * There is evidence that the corporate tax burden is fully passed on to bank customers in poor and rich countries alike. * Legal and institutional differences matter. Indicators of better contract enforcement, efficiency in the legal system, and lack of corruption are associated with lower realized interest margins and lower profitability. This paper-a product of the Development Research Group-is part of a larger effort in the group to study bank efficiency.

Does seller concentration in a market raise prices? Many attempts have been made to test this classic hypothesis of oligopoly theory, none of them convincing. Leonard Weiss and his colleagues have devised and applied a systematic set of direct tests of the concentration price hypothesis. In an innovative series of empirical studies, they examine the effect of concentration on price for the same item sold in markets that vary because of space, time, or transaction. They conclude that concentration does indeed tend to raise price. Studies in the book's first part test specific aspects of the concentration price hypothesis. These include a case study of Portland cement deregulated fares, the relation between change in price and change in concentration in the US and in the EEC, the effect of the numbers of bidders in auctions, and the effects of concentration on wages. The book's second part brings together for the first time previously published and widely scattered studies of the concentration price relationship in advertising media, retailing, the railroads, livestock purchasing, and banking. Viewed together, they provide powerful support for the role of concentration in determining price. Leonard W. Weiss is Professor of Economics at the University of Wisconsin, Madison.P>

This work focuses on the evaluation of mergers. Present methods of evaluating mergers are discussed along with suggestions for changes in these methods.