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What is “beta” for an investment or a portfolio, and how do I use it?
Beta is an indication of a Stock's risk with respect to the market.  For instance if a stock had a beta of 1 it means it is in tandem with the S&P 500. If it is more than 1, the stock is volatile.  If it is less than 1, it implies market movement doesn't affect this stock much. Tech stocks and small cap stocks have high beta, utilities have low beta. (In general, not always). Hope this helps - I've tried to explain it in very simple terms!