index of social purchasing power

例句：

1. 1. Theindex of social purchasing power has been steadilyincreasing.
   社会购买力指数稳步上升。
2. 2. Thisindex is used to measure the overall strengthof a country's economy.
   这个指数用于衡量一个国家经济的整体实力。
3. 3. The governmentis closely monitoring this index to ensure itsstability.
   政府正密切关注这一指数，以确保其稳定性。