Bretschger (U. of Greifswald, Germany) begins his examination with the standard growth models of the 1950s and 1960s and then extends his analysis to the "new" growth theory, in which the long-term growth rate of an economy is an endogenous variable. The book concludes by evaluating to what extent growth theory is able to explain the international differences in living standards, and considers the issues of sustainable growth under newer environmental regulations.