Question: the two requirements for a market to exist are
[{'answer': 'buyers and sellers', 'provenance': [{'wikipedia_id': '3736784', 'title': 'Market (economics)', 'start_paragraph_id': 3, 'start_character': 78, 'end_paragraph_id': 3, 'end_character': 96, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'exchange any type of goods , services and information'}, {'provenance': [{'wikipedia_id': '3736784', 'title': 'Market (economics)', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 966, 'bleu_score': 0.987691721403756, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17094354550810479784}, 'section': 'Section::::Abstract.'}]}]