Consumer cohorts and demand elasticities
使用混合效应模型估计不同年龄群体对蔬菜、肉类和鱼类的价格与支出弹性，发现老年群体对鱼类的消费倾向更高，而年轻群体替代老年群体后，鱼类消费份额可能下降。
A mixed effects model is used to estimate intercepts, price and expenditure elasticities for vegetables, meat and fish in different cohorts. Results from Wald tests reveal that intercepts for fish are higher for older cohorts than for younger cohorts, and expenditure elasticities for meat are higher for older cohorts than for younger cohorts. The implication is that over time, when younger cohorts replace older cohorts, the total expenditure share for fish is likely to decrease contributing to a negative trend in fish consumption. For meat, the total expenditure elasticity is likely to decrease.