Question: which economic system relies on the interaction of buyers and sellers
[{'answer': 'A market system', 'provenance': [{'wikipedia_id': '170431', 'title': 'Market system', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 15, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '170431', 'title': 'Market system', 'start_paragraph_id': 1, 'start_character': 2, 'end_paragraph_id': 1, 'end_character': 357, 'bleu_score': 0.9200664513440551, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6105247066418560869}, 'section': 'Section::::Abstract.'}]}]