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Understanding the phrase “afford to lose” better
The advice to "Only invest what you can afford to lose" is good advice. Most people should have several pots of money: Checking to pay your bills; short term savings; emergency fund; college fund; retirement. When you think about investing that is the funds that have along lead time: college and retirement. It is never the money you need to pay your bills.  Now when somebody is young, the money they have decided to invest can be in riskier investments. You have time to recover. Over time the transition is made to less risky investments because the recovery time is now limited. For example putting all your college savings for your recent high school graduate into the stock market could have devastating consequences. Your hear this advice "Only invest what you can afford to lose" because too many people ask about hove to maximize the return on the down payment for their house: Example A, Example B. They want to use vehicles designed for long term investing, for short term purposes. Imagine a 10% correction while you are waiting for closing.