Perfect competition & natural monopoly theory - myth or reality?

Economics Economics Questions
,
1

So many economists adopt perfect competition theory. Any ounce of truth to it?

What are the best arguments that smash it, namely that amount firms don’t matter?

Thanks,

Chris

2

The Myth of Natural Monopoly

Very interesting lecture. The part about the real uses of anti-trust law is great stuff.

3

Monopoly and Competition (by Murray N. Rothbard)
http://mises.org/media/4603/

Study Guide to Chapter 10 of Man, Economy and State - Monpoly and Competition
http://mises.org/rothbard/mes/guidechap10.PDF