Complementary symmetry was derived before under particular theories, and used to test those. Progressively general results were published. This paper proves the condition in full generality, providing a one-line proof, and shedding new light on its empirical implications.

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Keywords Buying price, Complementary symmetry, Selling price, WTA, WTP
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Journal Journal of Mathematical Psychology
Wakker, P.P. (2020). A one-line proof for complementary symmetry. Journal of Mathematical Psychology, 98. doi:10.1016/