If the price of stock falls dramatically, but on a booster thinks it will go up again. What is the investor likely to do?

If the investor believes that the price of the stock will go up again in the future, they may choose to hold onto their shares and wait for the price to recover. This strategy is known as "buying the dip" and involves having patience and confidence in the long-term prospects of the stock. Alternatively, the investor may choose to purchase more shares of the stock at the lower price in order to lower their average cost basis and potentially increase their profits when the stock price rebounds. Ultimately, the decision on what to do will depend on the individual investor's risk tolerance, financial goals, and assessment of the stock's future potential.