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. 2009 Jan 15;106(4):1009–1014. doi: 10.1073/pnas.0811967106

Fig. 4.

Fig. 4.

Mean coefficient of variation for investor rates of return for a given type of economy (RK and No RK). Shown is the average of session mean coefficient of variation for period t investor rates of return calculated at the dyad level for periods 1 through 10 for the recordkeeping and no recordkeeping economies.