An "investment" is using money for the purpose of making more money. An "investment RISK" is the potential of one's investment to go up or down.
Yes, I believe a primary home IS an expense...one must live somewhere. And unless one is a "investulator," and is leveraged to the eyebrows in a hot housing market, most folks who've been living in their homes a long time and then sell will find that when they add up ALL the costs of primary homeownership...not just Purchase Price - Selling Price = Profit, they've made only very modest returns vs. other asset classes.
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