Final answer:
The division of variables into real and nominal is associated with classical economists and reflects the dichotomous nature of economic perspective that also distinguishes between Keynesian and neoclassical economics.
Step-by-step explanation:
The division of variables into real and nominal is a dichotomy assumed by classical economists. This concept is not attributed to John Maynard Keynes, the wealth effect, or short-run macroeconomic theory. In the context of macroeconomics, the field is understood through various lenses. One such dichotomy is between the thought processes of Keynesian and neoclassical economists. Rather than viewing macroeconomics as a battleground of purely one perspective against the other, many mainstream economists, including Nobel laureate Robert Solow, recognize the merit in both Keynesian and neoclassical perspectives. This balanced approach reflects a more nuanced understanding of economic principles and practices. The same idea goes for the perception of labor division, which was fundamentally introduced by Adam Smith in his seminal work, The Wealth of Nations, where he explains how production processes are efficiently distributed among a cluster of workers rather than being undertaken by a single individual.