Presents the Nobel winners in economic sciences, from 1991-1995: R.H. Coarse (1991), for his discovery and clarification of the significance of transaction costs and property rights for the institutional structure and functioning of the economy; G.S. Becker (1992) for having extended the domain of microeconomic analysis to a wide range of human behaviour and interaction, including nonmarket behaviour; R.W. Fogel and D.C. North (1993), for having renewed research in economic history in applying economic theory and quantitative methods in order to explain economic and institutional change; J.C. Harsanyi, J.F. Nash and R. Selten (1994), for their pioneering analysis of equilibria in the theory of non-cooperative games; and R.E. Lucas, for having developed and applied the hypothesis of rational explanations, and thereby having transformed macroeconomics analysis and deepened the understanding of economic policy.