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. 2012 Apr 23;109(19):7236–7240. doi: 10.1073/pnas.1120893109

Fig. 1.

Fig. 1.

Passengers from 20 cruises were offered personal photos for $5, passengers from 20 other cruises were offered to buy the photo for $15, and passengers from 20 other cruises could “pay what you want.” The panel reports financial data for the three treatments. The figure shows the distribution of prices and revenue for passengers in the PWYW treatment. All data were reported and analyzed at the boat level.