The question of “underconsumptionism” is a tangled one—due not only to the commonplace fallacy associated with what is known as “crude underconsumptionism,” but also because the term has been used at various times to refer to what Joseph Schumpeter in his History of Economic Analysis called “non-spending” or effective demand theories (the second in a typology of underconsumption theories designated by Schumpeter). Underconsumption in this sense, however, would encompass theorists like Keynes and Kalecki who focus not on underconsumption per se, but on underinvestment. Hence, the term is no longer applied to theories of this type (except by some Marxian critics of “underconsumptionism”).… In the following exchange with Jonathan Penzner published in the April 1982 issue of Monthly Review, Harry Magdoff and Paul Sweezy, then editors of the magazine, pointed to the fallacy of crude underconsumptionism.