> Free markets always tend towards monopoly/oligopoly/cartel structures in the long term - because the firms that do so retain their pricing advantage (profits) and the firms that don't - die.
Can you give any example?
> Free/natural markets are probably one of the greatest lies ever sold.
What do you mean? Free markets are not a lie. There are tons of free markets. If I buy bread at the supermarket, I can choose among multiple brands.
Any industry that makes money will tend towards this in one form or another. This does not mean that there are no competitors or independents not making money - it merely means the vast majority of the market is consumed by a few companies/brands who set the prices and keep price floors.
Bread is an example of a cartel structure reinforced with marketing, economies of scale (monopoly) and previous consumer buy in. You can choose from multiple brands - but you'll notice the price of bread isn't falling very quickly - it's an implicit pricing pact - you can undercut your competitors - but not for long, and definitely not forever.
Oh, I see you're using a definition of Cartel that's rather different than the standard one[1]. If you just mean that commodity producers more or less converging around a price without an explicit agreement between them to inflate that price than of course every commodity ends up being a "cartel" and you'd have a hard time finding an economist who would disagree with you.
Can you give any example?
> Free/natural markets are probably one of the greatest lies ever sold.
What do you mean? Free markets are not a lie. There are tons of free markets. If I buy bread at the supermarket, I can choose among multiple brands.