@article{{TPREF}{}, author = {VASILEV, A.}, title = { AGGREGATION WITH A NON-CONVEX LABOUR SUPPLY DECISION, UNOBSERVABLE EFFORT, AND RECIPROCITY (“GIFT EXCHANGE”) IN LABOR RELATIONS}, journal = {Theoretical and Practical Research in Economic Fields}, volume = {9}, number = {1}, year = {2018}, doi = {10.14505/tpref.v9.1(17).05}, url = {https://journals.aserspublishing.eu/tpref/article/view/2234} }