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Are traders 100% responsible for a stock's price changes?
Traders = every market participant. Not some shadow figure that excludes you just because you passively drop cash into a 401k Vanguard fund every paycheck. So yes, if everyone stopped trading then the price won't move. Trades are 100% responsible for the prices you see on charts and tickers. A stock won't be worth "$100" if nobody ever traded $100 for it. It only has that price now or in the past because somebody placed an order for it at $100 and somebody else filled that order at $100