Engel curve analysis

例句：

1. 1. The economist used the Engel curve to explain how income affects consumption.
   这位经济学家利用恩格尔曲线来解释收入如何影响消费。
2. 2. The company's financial performance was closely monitored using Engel curve analysis.
   该公司的财务状况通过恩格尔曲线分析得到了密切监控。
3. 3. The researcher conducted an Engel curve analysis to identify the factors that influence consumer spending.
   研究员进行了恩格尔曲线分析，以识别影响消费者支出的因素。