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Are my purchases of stock, mutual funds, ETF's, and commodities investing, or speculation?
Every investment comes with a risk. There is also a bit of speculation involved. In there is an anticipation that one expects the value to go up in normal course of events. By your definition "If I buy this equipment, I could produce more widgets, or sell more widgets," as an investment. Here again there is an anticipation that the widgets you sell will give you more return. If you are investing in stock/share, you are essentially holding a small portion of value in company and to that extent you are owining some equipment that is producing some widget .... Hence when you are purchasing Stocks, it would be looked as investment if you have done your home work and have a good plan of how you want to invest along with weiging the risk involved. However if you are investing only for the purpose of making quick bucks following so called hot tips, then you are not investing but speculating.