ZEW Discussion Papers

This paper gives a short overview of Monte Carlo studies on the usefulness of Heckman's (1976, 1979) two-step estimator for estimating a selection model. It shows that exploratory work to check for collinearity…

We analyse the Polish wage and unemployment structure between 1992 and 1995 on the basis of the Polish Labour Force Survey. It is shown that within this period wage inequality has stabilised. Surprisingly, wage…

The development of the West German earnings distributionin the 1980's is analysed on the basis of both the German Socio-EconomicPanel and micro-data from the Employment Register of the FederalLabour Office. We…

This paper explores the potential of an approach suggested by Manski of obtaining nonparametric bounds for treatment effects in evaluation studies without knowledge of the participation process. The practicai…

We analyse the duration of unemployment spells in Poland using data from the Polish Labour Force Survey of August 1994. The effects on the duration of unemployment of important socio-economic and demographic…

With the referral of the Kodak - Fuji market access dispute to the World Trade Organization, the role of retail distribution channel control by incumbent firms as a barrier to imports has drawn much interest.…

During the past half century many nations have adopted policies whose function is to discourage cartels and other restrictive practices. Industrialized nations led the movement toward pro-competition policies,…

This paper evaluates the profitability of applying four different volatility forecastingmodels to the trading of straddles on the German stock market index DAX. Special carehas been taken to use simultaneous…