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I think that they're saying that it's a spectrum. With very weak implicit incentives, the two are complements. With very strong implicit incentives, the two are substitutes. So as you move along he spectrum from weak implicit incentives to strong implicit incentives, you move from complements to substitutes. So in their examples, the strength of the IMPLICIT incentives determined the degree of substitutability. You can probably argue the same about the strength of EXPLICIT incentives. |
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