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Are traders 100% responsible for a stock's price changes?
When people talk about "the price" of a stock, they usually mean one of the following: Last price:  The price at which a trade most recently took place.  If someone sold (and someone else bought) shares of XYZ for $20 each, then until another trade occurs, the last price of the stock will be quoted at $20. Bid price: The highest price at which someone is currently offering to buy the stock. Ask price: The lowest price at which someone is currently offering to sell the stock. As you can see, all of these are completely determined by the people buying and selling the stock.