I should have stated traders affect the daily swings especially those associated with Nvidia. The trends are more the institutions, banks, brokerage houses, and wealthy individuals like Berkshire and several others.
Liquidity stress test valuation. Stocks don't keep going up into infinity.
~Day traders~ But mostly institutions... do this daily to keep valuation in check. Otherwise you get repeats of the great depression from unrealistic expectations. Corrections or ~manipulation~ keeps markets healthy. In turn it strengthens the economy else you'll be paying for $100 cheeseburgers and $150/hour minimum wage. The stock market does influence this.
Market Data 
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