This indicates that although the middle-income group got benefits from economic growth, their participation share is smaller than social average level.

相对收入水平的下降，表明该阶层在经济增长中获得了利益，但分享份额低于社会平均水平。

youdao

The key to raising the proportion of the middle-income group lies in increasing the income of the low-income group and regulating the excessively high income.

扩大中等收入者比重的关键在于提高低收入者收入水平 ，调低高收入者收入 ；

youdao

Do you think it is essential to build public housing for lower-middle-income group who cannot apply for public housing and may not have enough money for private housing in nowadays situation?

你觉得为未够资格申请公屋却未够资金购买私人住宅的中产阶层提供公屋是必须的吗？

youdao

Since independence in 1976, per capita output in this Indian Ocean archipelago has expanded to roughly seven times the pre-independence, near-subsistence level, moving the island into the upper-middle income group of countries.

FORBES: Seychelles

True, the original customer base of Dollar General was the price-conscious low income group, but it has since expanded its appeal to the middle-class families with its more varied assortment of products readily available at its stores.

FORBES: Discount Retailer Attracts New Investors As It Evolves Into One-Stop Shopping Destination

It is worth noting that there is a group of countries that are both middle-income and fragile.

ECONOMIST: Free exchange