Which is the best day on average to buy

The best day of the week to buy stocks, on average, is Tuesday, while the worst day is Monday. This conclusion is drawn from the analysis of the average daily performance of the S&P500 on individual weekdays over different periods in history. Tuesdays have been the most favorable with the highest average returns, and the weakest performance has been observed on Mondays. However, it's important to note that the differences in performance between weekdays become negligible when using longer periods of history.

1. Tuesday's Advantage: The historical data suggests that Tuesday is the optimal day for buying stocks, as it has consistently shown the highest average returns. This may be attributed to a phenomenon known as the "Tuesdays up" effect, where stock prices tend to rise on Tuesdays.
2. Avoiding Mondays: Mondays have been the least favorable day for stock purchases, with the lowest average returns. This is in line with the broader observation of a "Monday effect," where returns on Mondays are often lower than those of the preceding Friday, contributing to the weekend effect.

While Tuesday is the best day on average, it's crucial to consider other factors like overall market conditions, news events, and individual stock analysis before making investment decisions. The day of the week should not be the sole determinant in a trading strategy.