- Wealth IS a Zero-Sum Game - http://web.cetlink.net/~kellycm/Zero-sum.html
In Defense of Democratic Capitalism says that wealth is a zero sum game (this means that there is always a loser whenever anyone gains, and all exchanges therefore make someone lose or everyone break even).
- The Panel Study of Income Dynamics - http://psidonline.isr.umich.edu/
Longitudinal survey of a representative sample of US individuals and families, which has been ongoing since 1968.
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