It’s not a need, just a consequence of how many trades are being made every minute.
Unlike a store, there is no such thing as a “fixed price” in a stock market. The stock price you see on the board is the last price anyone sold or bought that stock for. If you want to buy or sell a price you can sell or buy it for whatever you want, as long as you get someone who is willing to sell you or buy that stock from you at that price. If you sell a share for $1 per share that’s going to be the new price, until someone trades for a different price.
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