This means you are now entitled to 8% of the company’s profits, without having to run any day to day operations.
The stock market, is a marketplace where individuals such as you and me come together to buy and sell stocks. Using our example above, Apple only has 1000 shares available, and for educational purposes we will assume that they cannot issue anymore shares. Therefore the only way for individuals to acquire shares in Apple would be to buy them from other individuals at the stock market. This means that individuals will name their own price for which they are willing to sell their shares. The price could be significantly more or significantly less than what you feel they are worth. The main point to keep in mind though is the underlying asset, the stock (part ownership in the business) no matter what you and the seller decide the purchase price to be, has not changed and the stock market does not effect the business of that company.