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Stocks are pieces of owernship in a company. If you buy a share of Microsoft, you own about one 10 billionth of the company. That gives you the right to one 10 billionth of the money earned by the company and a one 10 billionth say in how the company is run (indirectly through the power to vote on directors and proxies).
The value of a share of stock is the value of the future earnings the stuff the company has (assets) minus the stuff the company owes (debts) and the value of all the money it will earn in the future. Because no one knows how much money a company will earn in the future, there is not perfect way to determine how much a company is worth. Instead, we establish the value by letting people freely buy and sell their shares. The price at which buyers are willing to buy and sellers are willing to sell is the price of the stock.
The stock market is the place (sometimes a phyiscal place, sometimes a virtual place) where people go to buy and sell their stock. An investor is someone that buys shares of a company (stock) to get a share of the earnings of the company. They get that in two ways. The company can pay out some of its earnings in the form of dividends (checks sent to the shareholders in proportion to how many shares they have). Alternatively, companies can keep some or all of their earnings and invest it back in the company to increase the companies assets and future earnings. Which a company decides to do depends on a lot of factors, including its ability to grow with more money, the tax treatment of dividends compared with capital gains (the money an investor makes by selling a stock for more than they paid for it), and other factors.
A speculator is someone that buys shares of a company because they believe that someone else will buy them for more money later. They usually have a much shorter term outlook than investors and are concerned more about the perception of the company rather than the true earnings potential of the company.
The stock market has so much power because companies have so much power. Companies have so much power because that's how primarily we organize our economic production. The stock market isn't really the thing with the power. It's more or less the thing that makes the value of our companies visible. When companies are doing well and people are willing to pay a lot for them, the stock market does well. When companies are doing poorly and people aren't willing to pay much for them, the stock market does badly. In both cases, the market really just reflects opinions about the companies, it doesn't set those opinions.
It's a pretty lousy way to set the value of companies. It's subject to manipulation. It fluctuates far more than the real value of the companies. The problem is that there aren't any better alternatives. It's like democracy - it's the worse possible way to run a government except for all of the alternatives. Like democracy, it needs to be carefully managed/regulated to makes sure that it is fair and you need to accept the fact that, while it can always be improved, it will never be perfect.
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