Question: who has first introduced the concept of merit goods and when
[{'answer': 'Richard Musgrave', 'provenance': [{'wikipedia_id': '46833807', 'title': 'Merit good', 'start_paragraph_id': 1, 'start_character': 55, 'end_paragraph_id': 1, 'end_character': 71, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': '1957', 'provenance': [{'wikipedia_id': '46833807', 'title': 'Merit good', 'start_paragraph_id': 1, 'start_character': 73, 'end_paragraph_id': 1, 'end_character': 77, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': '1959', 'provenance': [{'wikipedia_id': '46833807', 'title': 'Merit good', 'start_paragraph_id': 1, 'start_character': 79, 'end_paragraph_id': 1, 'end_character': 83, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '46833807', 'title': 'Merit good', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 694, 'bleu_score': 0.9431469728380061, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10404900143675744761}, 'section': 'Section::::Abstract.'}]}]