a well-substantiated explanation of some aspect of the natural world; an organized system of accepted knowledge that applies in a variety of circumstances to explain a specific set of phenomena

the branch of social science that deals with the production and distribution and consumption of goods and services and their management

the theory that an increasing consumption of goods is economically beneficial

the economic theories of John Maynard Keynes who advocated government monetary and fiscal programs intended to stimulate business activity and increase employment

an economic theory advocating free competition and a self-regulating market

Malthus' theory that population increase would outpace increases in the means of subsistence

an economic theory holding that variations in unemployment and the rate of inflation are usually caused by changes in the supply of money

the branch of social science that deals with the production and distribution and consumption of goods and services and their management