A short essay in which Schumpeter laid the groundwork for analyzing economic processes using individualistic terms as opposed to collectivist terms such as national income or social capital. He differentiates political individualism from methodological individualism. His concept of M.I. seeks to explain social phenomena as being meaningful from the point of view of acting humans. Those familiar with the Austrian School will recognize this as having to do with praxeology.
I enjoyed seeing Friedrich A. Hayek write the preface in 1980 and explaining how it wasn’t translated for ninety years because Schumpeter changed his views over time and never bothered and moved on to other works.