https://edgeormyth.com/Popular trading beliefs, checked against the real price history, with costs counted.enhttps://edgeormyth.com/tests/sell-in-may/https://edgeormyth.com/tests/sell-in-may/Thu, 15 Oct 2026 06:00:00 +0000We ran the old Wall Street saying through 55 years of S&P 500 prices and 8 stock markets. The summer slump shows up almost everywhere. Trading on it did not pay.https://edgeormyth.com/tests/full-moon/https://edgeormyth.com/tests/full-moon/Thu, 15 Oct 2026 06:00:00 +0000A 2006 study of 48 countries found that stock markets earned less in the half of the lunar month around the full moon. We checked 14 indices from 2004 to 2026, all of it after the study's data. The gap shrank to a quarter of its size, flipped after 2014, and luck explains what is left.