The nitty-gritty of how an economic system functions — how, in our world, men and women work, produce, exchange, and survive — was something from which they prudishly averted their eyes, as pertaining to the nether-regions. These “materialists” and “scientific socialists” lived in a mental world where understanding Hegel, Feuerbach, and the hideousness of Eugen Duehring’s philosophical errors was infinitely more important than understanding what might be the meaning of a price.