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Why is day trading considered riskier than long-term trading?
It's important to distinguish between speculation and investing. Buying something because you hope to make money on market fluctuations is speculation. Buying something and expecting to make money because your money is providing actual economic value is investing.  If Person A buys 100 shares of a stock with the intent of selling them in a few hours, and Person B buys 100 shares of the same stock with the intent of holding on to it for a year, then obviously at that point they both have the same risk. The difference comes over the course of the year. First, Person B is going to be making money from the economic value the company provides over the whole year, while the only way Person A can make money is from market fluctuation (the economic value the company provides over the course of an hour is unlikely to be significant). Person B is exposed to the risk of buying the stock, but that's counterbalanced by the profit from holding the stock for a year, while Person A just has the risk. Second, if Person A is buying a new stock every hour, then they're going to have thousands of transactions. So even though Person B assumed just as much risk as Person A for that one transaction, Person A has more total risk.