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Would betting on fallen (blue chip) stocks be a good strategy?
You can't do this automatically; you want to understand whether the drop is from a short-term high. is likely to be a short-term low, or reflects an actual change in how folks expect the company to do in the future. Having said that, some people do favor a strategy which resembles this, betting on what are known as "the dogs of the Dow" in the assumption that they're well trusted but not as strongly sought and therefore perhaps not bid up as strongly. I have no opinion on it; I'm just mentioning it for comparison.