With the current rally in stocks, it’s easy to feel like the best chance to buy is long past. Worse yet, with market levels now approaching an all-time high, it’s even scarier to invest for fear that another drop is right around the corner. It’s easy to think that way - if stocks are at their peak, isn’t down the most likely place to go?
Using the same approach I wrote about yesterday, I took a subset of all stock data going back to 1928 that only captured investments made on days the stock market was at an all-time high. I then compared it to investments made at any point (all-time high or otherwise):

I was honestly surprised by this result. I expected investment performance to be significantly lower when someone invests at an all-time high. But, at least in the first five years, there is no difference in probability of turning a profit.
That changes a bit in the long-term. On that end, there is a more noticeable difference. But, it still isn’t that crazy different in my opinion. So, if you are worried about seeing a loss on your investment but want to invest when the market is at an all-time high, my suggestion is to not worry about it too much!