{"first_sentence": {"type": "/type/text", "value": "The realm of economic theory is to explain what can be observed as the result of human actions in the market system."}, "physical_format": "Paperback", "last_modified": {"type": "/type/datetime", "value": "2008-04-30 09:38:13.731961"}, "weight": "1.1 pounds", "languages": [{"key": "/l/eng"}], "type": {"key": "/type/edition"}, "publishers": ["Routledge"], "number_of_pages": 208, "isbn_13": ["9780415771085"], "id": 13253104, "edition_name": "1 edition", "isbn_10": ["0415771080"], "publish_date": "August 9, 2000", "key": "/b/OL9889830M", "authors": [{"key": "/a/OL3343929A"}], "title": "Entrepreneurial Theory of the Firm", "contributions": ["Israel M. Kirzner (Foreword)"], "subjects": ["Economics"], "physical_dimensions": "8.4 x 5.5 x 0.6 inches", "revision": 1}