Ian wrote, > Households are suppliers/producers of labor power, no? Yes, but this does not mean that your economic theory must underline (or start with) the role of "households."
My starting point for understanding economic behavior in capitalism is the process of surplus generation within the firm, the use of this surplus, the economic/social/cultural/political consequences of the generation (and various uses) of the surplus, and the role of coercion and consent in the extraction of the surplus. One can certainly start with suppliers of various inputs (labor power and other stuff) to generate a theory of the economy--this is neoclassical economics--but the sorts of issues that you find natural to discuss within the resulting framework are not really that interesting to me. Eric