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Buffett's Rule of the 20 Punch Card
In the US, we can trade with zero frictional costs. We don't pay any commissions if you don't want to. So on the surface, these look like great things. In reality, what would help investors a lot would be Buffett's rule of the 20 punch card. He says that if you were allowed to only buy 20 stocks in your entire lifetime, you would be really careful about each stock that you bought.