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?