?:authorAffiliation
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[\'Department of Economics, University of Perugia, Perugia, Italy. Electronic address: simona.bigerna@unipg.it.\', \'Department of Economics, University of Perugia, Perugia, Italy; King Abdullah Petroleum Studies and Research (KAPSARC), Riyadh, Saudi Arabia.\', \'Department of Economics, University of Perugia, Perugia, Italy.\']
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