I want to point out that a feudal system is not possible in a highly technical-developed society. There is no way you can sustain the machinery, the structure and the knowledge with a feudal system.

What you can indeed have is a "South-America in the 80's" world. That is, you can have societies where 30% are not considered citizens (no-status, hunger..), 30% have low level jobs, 30% are middle class (the technics sustaining hte knowledge) and 10% have huge amounts of wealth.

The present 15% of low wage workers, 70% roughly in the middle and 15% super rich can indeed change and become more unequal. But the famous 10% at the top and 90% in misery of feudal societies is just not possible.. luckily.  This is not to say that the world some people have in mind is not disgusting.

A pleasure

I therefore claim to show, not how men think in myths, but how myths operate in men's minds without their being aware of the fact. Levi-Strauss, Claude