Why do you think workers here are underpaid by a third?
It follows logically from the idea that wages are derived from productivity. Productivity has dramatically increased over the last thirty years. Wages have not kept pace. The point here is not that workers are "underpaid" but that this calls into question the idea that wages follow productivity.
Those charts you lefties keep digging up do not tell the whole story.
For example, they do not take into account use of machines to do work that was previously done by hand. The charts do not indicate a recognition of new technologies that allow for efficiency.
This appears to go to Obama's whining about ATM's.....Sure. the need for human bank tellers is reduced due to machines doing some of the work. That is an example of increased productivity and reduced labor cost.
BTW, the creators of these charts appear to have deftly left out the fact that the need for workers in certain jobs has been diminished by the use of technology. The charts make it appear as though wages have gone down while what is actually indicated is the cost of labor which is lower.
The pro labor people have made a point of wages vs productivity as one of the planks in the class envy platform.
In the world of organized labor productivity is a dirty word.
To union people, doing the job efficiently with the use of labor saving tools and devices threatens job security.
I went through this while working in a union paint shop back in the mid 80's.
Some of the prohibited tools...Any paint roller exceeding 9" in lengths. I had used 12" and 15" rollers on jobs I had done privately. Got it done quicker. On wall board finishing, the widest knife permitted by the union was 6"...I had always used a 10" knife for the final coat of mud..
To me this makes no sense.
The idea is to do the job as efficiently with the highest quality possible and hopefully come under the budget. Doing that makes the company a more attractive candidate for future jobs.
Unions have no concept of budgets. Their interest lies with keeping the union in business.
Unions stay in business by making work for the members.
This obviously inflates the cost of labor and thus makes it appear as though wages are keeping up with productivity. It's all a facade.