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The neoclassical theory of investments, as formulated by Dale Jorgenson (1963, 1967), can be expressed in a fairly straightforward way.¹ Neoclassical formulations such as Jorgenson's were preceded by contributions by many influential economists. Both John Maynard Keynes and Irving Fisher, for example, argued that investments are made until the present value of expected future revenues, at the margin, equals the opportunity cost of capital. This means that investments are made until the net present value is equal to zero.

In “An Austrian Theory of Spatial Land,” Fred E. Foldvary addresses the disregard of spatial issues in basic Austrian economic theory as formulated by Carl Menger (1871) and elaborated upon by Ludwig von Mises (1940). Foldvary shows that Johann Heinrich von Thünen (1826) and Henry George (1879/1884), in particular, serve to fill these gaps in the classical Austrian theory of the market process. Moreover, a theory that incorporates spatial land leads to the conclusion that Austrian business cycle theory is incomplete: The “malspeculation” that accompanies urbanization whenever capital and labor rather than land are the main sources of tax revenue will have to be added to the malinvestment that is caused by expansionary monetary policies.