The stock market can go up and down quickly. This is because there are many factors that affect the price of stocks. For example, the price of a stock can go up and down when the company reports its profit and earnings. But the price can also move a lot between earnings, depending on news and market expectations. The value of a company is based on expectations of future revenue. In other words, if the market has different opinions about the company’s future income, the stock will move more.