CONSTANT‐QUALITY PRICE INDICES FOR AGRICULTURAL INPUTS: TRACTORS AND FERTILISERS REVISITED
用享乐回归法构建英国二战后拖拉机与化肥的恒定质量价格指数，并与官方价格序列对比，对研究农业技术进步和投入品价格变化有参考价值。
This paper employs the hedonic regression technique to construct constant‐quality price indices and quality change indices for two agricultural inputs ‐ tractors and fertilisers ‐ over the period since World War II in the UK. The technique is described and related to productivity measurement in order to show its relevance for measuring price changes for inputs subject to technological improvement. Problems of application are discussed with reference to the two inputs. The constant‐quality price indices derived for tractors and fertilisers are briefly compared with available ‘official’ price series