If 20% of people own 80% of the land or wealth or whatever in a capitalist country then all that shows is that capitalism produces Pareto distributions. That does not mean Pareto distributions are some universal law of nature nor does it mean that non-capitalist systems are impossible.

Why would it matter if he heard about a debunked theory only loved by reactionaries?

The pareto principle was produced by guessing based on anecdotal observations it was never a serious thing

You should e-mail that to the presidents of Cuba, Venezuela, and China, to show them the error of their communist ways.

Somebody hasn't heard of the Parenti principle...

The one that stated that 80% of the land in italy was owned by 20% of the people? I think they did hear about it and did apply it to Cuba but I might be wrong there.

The Pareto Principle is a bullshit theory where a crank saw a handful of statistics were similar and thus decided it was a natural law. The only reason it's still considered seriously is because economics is to mathematics what astrology is to physics.

Evolution creates a lot of crabs, and you can find the golden ratio expressed in nature all over. What does that have to do with the price of tea?

What does the productive capabilities of peas have to do with how we should structure society?