英文文献：Demand for U.S. Lamb and Mutton: A Two Stage Differential Approach-对美国羔羊肉和羊肉的需求:分两个阶段进行差异处理
英文文献作者：Jones, Keithly G.,Hahn, William F.,Davis, Christopher G.
英文文献摘要：
Estimates of price and scale demand elasticities for lamb and mutton consumed in the United States are derived. The U.S. lamb and mutton consumption comprises primarily of domestic production, and imports from two countries-Australia and New Zealand. The Netherlands Central Bureau of Statistics (CBS) demand system derived by Keller and Van Driel (1985) is employed. The CBS model is preferred as it combines non-linear Engel curves with the simplicity of the Slutsky matrix and allows for the ease of implementing concavity and other restrictions. Empirical results for own-price elasticities of demand indicate that U.S. demand for Australian lamb demand is highly elastic while U.S. demand for New Zealand and domestic lamb was inelastic. The scale demand elasticity results indicate that if the U.S. increases total demand for lamb, Australia and New Zealand's share of total demand will more than proportionately increase while the U.S. share of total demand will decrease. The scale elasticities show that domestic lamb is an inferior good.

对在美国消费的羊肉和羊肉的价格和规模需求弹性进行了估计。美国的羊肉消费主要来自国内生产，以及从澳大利亚和新西兰两个国家的进口。采用了由Keller和Van Driel(1985)推导出的荷兰中央统计局(CBS)需求系统。CBS模型是首选的，因为它结合了非线性Engel曲线和Slutsky矩阵的简单性，并允许易于实现凹性和其他限制。需求的自有价格弹性的实证结果表明，美国对澳大利亚羊肉的需求具有高度弹性，而美国对新西兰和国内羊肉的需求没有弹性。规模需求弹性结果表明，如果美国对羊肉的总需求增加，澳大利亚和新西兰占总需求的比例将增加，而美国占总需求的比例将下降。规模弹性表明，家养羔羊是次品。