After decades of rising global economic integration, the world economy is now fragmenting. To measure this phenomenon, we introduce an index of geopolitical fragmentation derived from various empirical indicators. This index is developed using a flexible dynamic factor model with time-varying...

We present an econometric method for estimating the parameters of a diffusion model from discretely sampled data. The estimator is transparent, adaptive, and inherits the asymptotic properties of the generally unattainable maximum likelihood estimator. We use this method to estimate a new...

This paper provides a general framework for integration of high-frequency intraday data into the measurement forecasting of daily and lower frequency volatility and return distributions. Most procedures for modeling and forecasting financial asset return volatilities, correlations, and...

This paper uses long-run real price and dividends series to investigate for the German stock market the questions asked of the U.S. market by Shiller (1989). It tries to determine in what periods and to what degree the German stock market has also possessed excess volatility' in the past...

The stochastic process for earnings is the key element of incomplete markets models in modern quantitative macroeconomics. We show that a simple modification of the canonical process used in the literature leads to a dramatic improvement in the measurement of earnings dynamics in administrative...

This paper provides a critical review of the empirical and theoretical literatures on illegal drug policy, including cross-country comparisons, in order to evaluate three drug policy regimes: criminalization, legalization and "depenalization." Drawing on the experiences of various states, as...

User sanctions influence the legal risk for participants in illegal drug markets. A change in user sanctions may change retail drug prices, depending on how it changes the legal risk to users, how it changes the legal risk to dealers, and the slope of the supply curve. Using a novel dataset with...

Excess drinking is associated with lost productivity, accidents, disability, early death, crime, neglect of family responsibilities, and personality deterioration. These and related concerns have justified special restrictions on alcoholic-beverage commerce and consumption. The nature and extent...

We find that alcoholism decreases labor force participation among prime age males, and therefore decreases the income of this group. The effects of alcoholism on the labor force participation of younger and older males and on the wage rates of prime age males are not significantly positive. We...

One of the most striking aspects of the recent recession is the collapse in international trade. This paper uses disaggregated data on U.S. imports and exports to shed light on the anatomy of this collapse. We find that the recent reduction in trade relative to overall economic activity is far...