Question: who developed one of the earliest versions of social exchange theory
[{'answer': 'George Homans'}, {'provenance': [{'wikipedia_id': '850579', 'title': 'Social exchange theory', 'start_paragraph_id': 3, 'start_character': 137, 'end_paragraph_id': 3, 'end_character': 1285, 'bleu_score': 0.8151635000593691, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17203361606084340381}, 'section': 'Section::::History.\n'}]}]