Notes and Communications

Summary This essay explores the occurrence of illusionary images or trompe-l’oeil in economics and their role in economic policy design. In this context four specific examples are discussed, relating to money illusion, the bias in the consumer price index to measure purchasing power, the econometrics of hyperinflation and the measurement of scholarly productivity. Fellow Tinbergen Institute and the Managing editor of De Economist. Until 2001 deputy executive director as well as head of research with De Nederlandsche Bank and from January 2003 professor emeritus in monetary economics, University of Amsterdam. I am grateful to professor J.S. Cramer and dr Peter van Els for their useful comments.