The Determinants of Wage Changes in Indexed and Nonindexed Contracts: A Switching Model
利用1979-86年加拿大工资合同样本，区分含生活费用津贴（COLA）和不含COLA的合同，通过计量模型纠正样本选择偏差，发现两类合同中工资变化的决定因素不同，且共同工资结构被数据拒绝。
Wage changes in a sample (1979-86) of Canadian wage contracts are analyzed. The sample is split into cost-of-living allowance (COLA) and non-COLA contracts. Econometric estimation corrects for sample selectivity bias. In non-COLA contracts, the unemployment rate and a proxy for expected inflation are significant. Expected industry price changes and productivity changes exert smaller but significant effects. In COLA contracts, ex ante inflation coverage ranges between 60% and 100% of expected inflation. Catch-up for previous uncompensated inflation, the unemployment rate, and expected inflation are also significant. A common wage structure across COLA and non-COLA contracts is rejected by the data.