social business developing country social entrepreneurship organic food willingness to pay africa sustainable consumption fair trade generalized propensity score matching ghana agriculture pineapple social sector fundraising rct monitoring and evaluation difference in difference evaluation methods matching m&e gemeinwohlökonomie evaluation pegnet entwicklungsökonomie kooperation entwicklungszusammenarbeit legal forms business model canvas certification organic agriculture endogenous switching regression shared value csr inclusive business impact small farmers globalgap social enterprise
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