French Parliament Fights iPod and iTunes
"In theoretical economics, a free market is an idealised economic model wherein exchanges are "free" of all coercive measures"
see that? all coercive measures. Not merely the governmental measures listed afterwards, but all of them. It is possible for a corporation to use coercive measures upon another economic unit (say a person or another corporation). Anti-monopoly law exists to allow the government to prevent a corporation from doing so, hence making the market behave more similarly to the free-market.
"In an absolutely free-market economy, all capital, goods, services, and money flow freely--transfers are not forcibly restricted or impeded. If a government intervenes in private affairs, it only does so to stop coercion that may take place among market participants."
Sums it up pretty well as well don't you think?