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Why is day trading considered riskier than long-term trading?
Day trading is an attempt to profit on high frequency signal changes. Long term investing profits on low frequency changes. What is the difference? High Frequency Signal = the news of the day. This includes things like an earnings report coming out, panic selling, Jim Cramer pushing his "buy buy buy" button, an oil rig blowing up in the ocean, a terrorist attack in some remote region of the globe, a government mandated recall, the fed announcing an interest rate hike, a competitor announcing a new product, hurricanes, cold winters, a new health study on child obesity, some other company in the same sector missing their earnings, etc. Think daily red and green triangles on CNBC: up a buck, down a buck. Low Frequency Signal = The long term effectiveness of a company to produce and sell a product efficiently plus the sum of the high frequency signal over a long period of time. Think 200 day moving average chart of a stock. No fast changes, just, long term trends. Over time, the high frequency changes tend to negate each other. To me, long term investing is wiser because the low frequency signal is dominated by a companies ability to function well over time. That in turn is driven by the effectiveness of its leadership coupled with the skill and motivation of its employees. You are betting on the company and its people. Pseudo-random shorterm forces, which you can't control, play less of a role.  The high frequency signal, on the other hand, is dominated by sporadic and unpredictable forces that typically can't be controlled by the company. It has some tinge of randomness about it. Trying to invest on that random component is not investing at all, it is gambling (akin to "investing" in that next coin flip coming up heads) I understand the allure of high frequency trading. Look at the daily chart of a popular stock and focus on the up and down ticks. Mathematically, you could make a killing if you could just stack all those upticks on top of each other. If only it was that easy.