indexation of tax allowances and taxation

例句：

1. 1. The index of the stock market has been rising steadily for the past few months.
   过去几个月，股市的指数一直在稳步上升。
2. 2. The index of the economy is closely monitored by economists around the world.
   经济指标由世界各地的经济学家密切监控。
3. 3. The company's index of customer satisfaction has improved significantly since the new policy was implemented.
   自新政策实施以来，该公司的客户满意度指数显著提高。