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The original was posted on /r/wallstreetbets by /u/market_distruptor on 2025-09-27 08:07:45+00:00.

This parameter of concentration of total market cap in top 10% stocks have been recently studied by me and i was fascinated by the accuracy of this parameter in the stock market. Here are few things it suggests 1)AlI eggs in one basket 2)Less diversity equals more vulnerability 3)Historical patterns of 1930 and 2000