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. 2019 Aug 3;16(15):2775. doi: 10.3390/ijerph16152775

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Probability of choosing a strong willingness strategy for different time t. (a) $p_{t} (0) = 0.2, q_{t} (0) = 0.8, f_{m} = 6$ ; (b) $p_{t} (0) = 0.2, q_{t} (0) = 0.8, f_{m} = 6$ ; (c) $p_{t} (0) = 0.8, q_{t} (0) = 0.2, f_{m} = 100$ ; and (d) $p_{t} (0) = 0.8, q_{t} (0) = 0.2, f_{m} = 100$ .