If Black Monday happens tomorrow, this is what you do: 1. Don’t panic. Remember that you own shares in a business. The market’s valuation is irrelevant. The business itself has nothing to do with the market. 2. Even if everything in you wants to sell, do the opposite. Now you buy. 3. Buy a little every day. Make sure you can sustain it for a month or two if the market continues to go down. You want to average down. Basically as you fall you buy a little every day. Do not sell your shares because the markets are scared. I do this in every market crash. I even use leverage when I do this. I borrow money from the bank. Not recommended. But I say this so you know there are plenty of investors who use the dips to get richer. This is what we do. We want cheap stock that gets revalued higher at a later point in time. So, relax and even welcome a Black Monday.