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When a stock price goes down, does the money just disappears into thin air?
Cash changes hands when you buy or sell the stock. While you own the stock, you own it, not cash, so there is no cash to go anywhere. You spent your money when you bought. The seller got that money. It's gone. You hope that when you sell the stock, someone will give you more money for it than you spent. But they may give you less. Money doesn't magically appear either way, it comes from the buyer. After selling, you have the money -- however much you sold for -- and no longer have the stock. NOTE that this means the current value of a share of stock is interesting, but not really very relevant, unless you are actively buying or selling. What your portfolio is worth on paper is nothing more than an approximate snapshot at the moment you retrieve the data. It is not a promise of what will actually happen when you do sell.