The free market doesn't exist. Every market has some rules and boundaries that restrict freedom of choice. A market looks free only because we so unconditionally accept its underlying restrictions that we fail to see them. How 'free' a market is cannot be objectively defined. It is a political definition. The usual claim by free-market economists that they are trying to defend the market from politically motivated interference by the government is false. Government is always involved and those free-marketers are as politically motivated as anyone. Overcoming the myth that there is such a thing as an objectively defined 'free market' is the first step towards understanding capitalism.
The first two sentences are pretty obvious but the political definition angle is interesting.
at the same time, you have to wonder how much of a strawman this is--perhaps a conservative response to this would be that they're just trying to find the right balance of govt interference, and that liberals are asking for too much