These volumes form collections of the Nobel Lectures delivered by the prizewinners, together with their biographies, portraits and the presentation speeches for the period 1969-1990. Each Nobel Lecture is based on the work that won the laureate his prize. New biographical data of the laureate, since they were awarded the Nobel Prize, are also included. These volumes of inspiring lectures by outstanding economists and social scientists should be of interest to every keen student, teacher and professor of economics and social sciences as well as those in related fields. Below is a list of the prizewinners during this period with a description of the work which won them their prizes: (1981) J. Tobin - for his analysis of financial markets and their relations to expenditure decisions, employment, production and prices; (1982) G.J. Stigler - for his seminal studies of industrial structures, functioning of markets and causes and effects of public regulation; (1983) G. Debreu - for having incorporated new analytical methods into economic theory and for his rigorous reformulation of the theory of general equilibrium; (1984) R. Stone - for having made fundamental contributions to the development of systems of national accounts and hence greatly improved the basis for empirical economic analysis; (1985) F. Modigliani - for his pioneering analyses of saving and financial markets; (1986) J. Buchanan Jr - for his development of the contractual and constitutional bases for the theory of economic and political decision-making; (1987) R.M. Solow - for his contributions to the theory of economic growth; (1988) M. Allais - for his pioneering contributions to the theory of markets and efficient utilization of resources; (1989) T. Haavelmo - for his clarification of the probability theory foundations of econometrices and his analyses of simultaneous economic structures; (1990) H.M. Markowitz, M.H. Miller and W.F. Sharpe - for their pioneering work in the theory of financial economics.