悬赏 3 个论坛币 已解决
【作者(必填)】
Colin G. Thirtle , David E. Schimmelpfennig and Robert F. Townsend
【文题(必填)】
Induced Innovation in United States Agriculture, 1880-1990: Time Series Tests and an Error Correction Model
【年份(必填)】
American Journal of Agricultural Economics
Vol. 84, No. 3 (Aug., 2002), pp. 598-614