Solution

You may think I'm just obsessed with economy. Why does it matter if our people of the working class have to support the living of many others ?

In fact, with the agricultural, industrial, and information technology revolutions, the productivity of each person is much increased, and it seems now at least theoretically possible that the many mouths could be fed.

But, hold on. From a society (or country) point of view, how could the subsistence of a large population depends on a small number of working hands ?

There are a few possible solutions:

1. heavy tax - if most of the country's revenue belongs to the people
2. dictatorship - if the government owns everything
3. communism
   

(I leave it to your interpretation whether solution #3 is actually the variant of #1 or #2.)

More so, even if you accept solution #1 and accept the scenario that the majority of the revenue and productivity of a society belongs to a small group of people, and there needs a high tax rate, you have also to face the accompanying wealth gap.