There are some who state that the increasing jobs and low numbers of unemployment are sign of prosperity; however studies show that the middle class have hardship in one or more sectors. Paying of medical bills is one sector that is a huge hardship. When the wages are stagnant or so tiny of an increase, the prosperity is not to be had for the middle class or the poor. Another sector is housing.
Per The Center Economic and Policy Research, de-unionization by labor management is standard practice. In 1980 there was a 20 percent union rate. It fell to 7 percent.
Another cited reason is the corporate control and plunder by executives and CEO’s. CEO pay for Fortune 500 companies now averages almost 300 times the pay of an average production worker.
http://cepr.net/publications/briefings/testimony/economic-hardship-middle-class. This report cites 4 main reasons why the middle class have rising economic hardship.