Modern Financial Market Theory – A Critique Based on the Logic of Human Action

The modern financial market theory (MFMT) – based on the efficient market hypothesis, rational expectation theory, and modern portfolio theory – has become the standard approach in financial market economics. In this article, the MFMT will be critically ­reviewed using the logic of human action (or: praxeology) as an epistemological meta­theory. It will be shown that the MFMT exhibits (praxeo-)logical deficiencies so that it cannot provide investors with well-founded decision-making support in real-world financial markets.