On the market, farmer Jones can get Ms. Smith's money only by offering her something that she values. Smith walks away. Ms. Smith's freedom not to contract with farmer Jones, along with her freedom to contract with other suppliers, ensures that farmer Jones will abandon his extremist position. Likewise, Ms. Smith cannot be an extremist. She might initially offer farmer Jones a mere one cent for each bushel of his corn, but farmer Jones need not accept.
Market prices balance the costs and benefits to all parties of producing and consuming.
Extremes are avoided. Suppose, though, that farmer Jones is so greedy that he isn't content to play by the rules of private property. So he successfully lobbies Uncle Sam for a higher, guaranteed minimum price for corn. The state might achieve this price hike by paying farmer Jones and other corn farmers to reduce their production, and by prohibiting upstart corn farmers from entering the market. Now we've got true extremism.