Portfolio theory has been an important component of open economy macroeconomic models. In those models, it is essential to distinguish among several categories of assets, both foreign and domestic, and to specify the demands and supplies. This framework has become increasingly relevant....

Winner of the Nobel Prize in 1981, James Tobin is one of the principle figures in contemporary Economics. These original contributions by such noted economists as Robert Solow, Paul Samuelson, Richard Cooper, and Edmund Phelps celebrate and extend Tobin's contributions to macroeconomics,...