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α: calibrated so average coauthorship-adjusted count equals average raw count
We study adverse selection using data from an 1808 Act of British Parliament that effectively opened a market for life annuities. Our analysis indicates significant selection effects. The evidence for adverse selection is strongest for a sub-sample of annuitants whose annuities were purchased by profit-seeking speculators, a sub-sample in which "advantageous selection" resulting from multi-dimensional heterogeneity is unlikely to have been significant. These results support the view that adverse selection can be masked by advantageous selection in empirical studies of standard insurance markets.