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. 2016 Aug 1;113(33):9238–9243. doi: 10.1073/pnas.1519853113

Fig. 1.

Fig. 1.

Sample stimuli from the scanner paradigm. In each task, participants first made slider valuations for the four different products. Afterward, in the offer phase, participants saw 4 blocks (1 per item) of 31 prices at which the participants could choose to buy the item (WTP) or sell the item (WTA). These tasks were counterbalanced between participants and randomized sessions.