Really, what wikipedia redirects to is how to define economic terms? You don't even have to read past the introduction to see even the wikipedia page acknowledge there is a distinction, and that capitalist markets are not necessarily free.
"Capitalism involves the further abstraction of money into other exchangeableassetsand the accumulation of money through ownership, exchange, interest and various otherfinancial instruments.The accumulation of capital refers to the process of "making money", or growing an initial sum of money through investment in production. Capitalism is based around the accumulation of capital, whereby financial capital is invested in order to realize a profit and then reinvested into further production in a continuous process of accumulation.
The defining feature of capitalist markets, in contrast to markets and exchange in pre-capitalist societies like feudalism, is the existence of a market for capital goods (the means of production), meaning exchange-relations (business relationships) exist within the production process. Additionally, capitalism features a market for labor. This distinguishes the capitalist market from pre-capitalist societies which generally only contained market exchange for final goods and secondary goods."
Some requirements for a perfect free market, according to the father of Economics, Adam Smith:
A large number buyers and sellers
- No barriers of entry and exit
- Perfect factor mobility
- Perfect information
- Rational buyers
- No externalities
The corporation is the perfect example of capitalism undermining the free market - the government grants a corporate charter, giving the company a competitive advantage, due to its access to capital, over an independant business.
Go apply for a job at a construction company. But tell them you only want to work 10 hours a week. It's simply not worth their time and effort to go through the motions of hiring you. "It's the system, mannn!" No, it's reality.
That was the argument buisness made against the 40 hour work week too - which apparently didn't destroy the economy as predicted.
At less than 40 hours a week, a large number of people become willing to put in extra hours to increase their pay. That tells us that 40 hours is the sweet spot, or close to it.
At more than 40 lots of people are willing to put in extra hours too. The reason more don't is employers don't want to have to pay overtime.
If overtime kicked in at 20 hours, employers would would still not want to pay overtime, and lots of new jobs would become available, and there would be minimal unemployment. In fact, there would be a labor shortage, and since labor has a supply and demand relationship just like goods do, it would push wages up to where they should be

Socialism has been tried. It don't work.
I think you meant to say "communism"?
Socialism is still alive and well.
Denmark, Finland, Netherlands, Canada, Sweden, Norway, Ireland, New Zealand, Belgium, all socialist economies, and all, incidentally, with about as high or higher standards of living as the US.
A few examples doesn't "prove" what system is superior, but its enough to prove that it can work.