It is comparatively free. You don't have to go through many regulatory hoops to grow food and sell it. It's not remotely comparable to concocting a medicine and selling it.

The end of famine in America happened around 1800, as the free market and the industrial revolution fixed that problem. Famine persists in other areas that insist on collectivized farms or have other problems that prevent free market agriculture, such as warfare.

Even the Soviet Union had to import wheat from Kansas, and allowed farmers to farm their own plots and sell the results, because the collectivized farms could not produce enough.