Can you explain how in a free market (like libertarian idealists dream of) a fair social contract is possible?

[Rasputin]

No, I certainly can't

[Mastersoda239]

Most people in favor of free markets are not in favor of fairness but rather freedom. You might want to check out voluntary cooperation and how if one person benefits so too can another, life, in other words, is not a zero sum game

[desotobrave]

In a free market, the use of force and fraud are illegal. All relationships and transactions are voluntary.

[Bazinga!]

When you buy shoes, do you expect the government to step in and make sure you buy the right size or color? If you buy the wrong size or color, the fault lies with YOU, not the salesman, not the shoe store, not the "evil rich" shoe manufacturer. This is the reality of life, it is up to you to look out for your own interests, and take responsibility for your own actions and decisions. It's called freedom and personal responsibility. If you can't afford a loan or credit card, your responsibility is to refrain from applying for it. If you don't like a company, don't do business with them.

[hwinnum]

Life is not fair and never has been, and you can't make it fair by by playing Robin Hood. People are different. Some have more of a work ethic, some are luckier than others. If you think you can make a level playing field, you are the one that isn't seeing reality.
The Constitution promises equal opportunity - not equal outcomes. That is what we should be trying to accomplish. Favoritism to corporations or individuals is why gov't needs to be reined in.

[voicelessContender563]

All exchange is voluntary in the libertarian society. Otherwise, it is not true free-market exchange. It is a coercive society, which is wrong.