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The stock market on the other hand is different. you are buying a share (or a part) of the company you own it and you earn money based on your investment (called dividents) or you can sell it. Its like buying a house (as someone said before) The value of the house may increase later or decrease. It is in your control to decide which house (or stock) to buy based on expectations and forcasts of market trends. If you look at it that it is money that you did not earn, then don't take intrest from a bank cuz its money you did not earn (also goes of CDs, Bonds, etc...)