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What is the point of the stock market? What is it for, and why might someone want to trade or invest?
In finance, form is function, and while a reason for a trade could be anything, but since the result of a trade is a change in value, it could be presumed that one seeks to receive a change in value. Stock company There may have been more esoteric examples, but currently, possession of a company (total ownership of its' assets actually) is delineated by percentage or a glorified "banknote" frequently called a "share".  Percentage companies are usually sole proprietorship and partnerships, but partnerships can now trade in "units".  Share companies are usually corporations. With shares, a company can be divided into almost totally indistinguishable units.  This allows for more flexible ownership, so individuals can trade them without having to change the company contract. Considering the ease of trade, it could be assumed that common stock contract provisions were formulated to provide for such an ease. Motivation to trade This could be anything, but it seems those with the largest ownership of common stock have lots of wealth, so it could be assumed that people at least want to own stocks to own wealth. Shorting might be a little harder to reason, but I personally assume that the motivation to trade is still to increase wealth. Social benefit of the stock market Assuming that ownership in a company is socially valuable and that the total value of ownership is proportional to the social value provided, the social benefit of a stock market is that it provided the means to scale ownership through convenience, speed, and reliability.