Abstracts.

This section presents abstracts of several studies on economics. Julio J. Rotemberg and Michael Woodford examines the business cycle variation in the markup of price over marginal cost in the study Markups and Business Cycle. The paper Pitfalls and Opportunities: What Macroeconomists Should Know About Unit Roots, by John Y. Campbell and Pierre Perron, is an introduction to unit root econometrics as applied in macroeconomics. The paper first discusses univariate time series analysis. A second part of the paper tackles issues in a multivariate context where cointegration is the central concept. Jean Tirole's Privatization in Eastern Europe: Incentives and the Economics of Transition discusses how incentives and market structure considerations ought to guide the choice of sequencing and institutions in the privatization of state industrial property in Eastern Europe.