Are immigrants on welfare because they are more likely to be eligible or because they are more likely to claim benefits for which they are eligible? The answer is politically important, but because most current research on immigration and welfare is based on data from the U.S., the answer is...

Based on the hypothesis that microdata are of crucial importance for internationally competitiveeconomic research and scientific advice in economic and social policy, the authorsdevelop various proposals for an improved data supply for empirical work in Germany. Present shortcomings are mainly...