https://www.cnbc.com/2021/05/12/net-worth-to-be-considered-wealthy-in-2021.html
https://money.usnews.com/money/personal-finance/family-finance/articles/are-you-rich-how-the-wealthy-are-defined
不过我还是没有富人思维,所以没有考虑两千万才起步。