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. Author manuscript; available in PMC: 2014 Dec 1.
Published in final edited form as: J Health Econ. 2013 Sep 20;32(6):10.1016/j.jhealeco.2013.09.007. doi: 10.1016/j.jhealeco.2013.09.007

Table 1.

Two-by-Two Experimental Design

Opt-in Opt-out
Without Priority Rule Control Treatment Opt-out Treatment
With Priority Rule Priority Treatment Opt-out with Priority Treatment