: The "Monday Effect" was significantly more pronounced in the 1980s and 1990s but has weakened as markets become more efficient and technology allows for 24/7 news consumption.
Based on 98 years of S&P 500 data (through 2026), daily performance trends typically follow these patterns: Average Return : -0.07%. Trend : Over 51% of Mondays since 1928 have finished lower. best and worst day of the week to buy stock
: Historically yields the highest average returns, often due to influential companies reporting earnings mid-week. Thursday (Moderation) : The "Monday Effect" was significantly more pronounced
: Generally falls between Tuesday and Friday in performance. Friday (Best for Selling) Success Rate : Ends "green" 54.6% of the time. best and worst day of the week to buy stock