You could make an argument that those things aren't bought and sold in a free market. Passenger planes and general aviation planes are at least semi-commoditized, but fighters, bombers, spy planes, missiles are all built for basically one buyer, the US DoD. The DoD decides which firms succeed and which fail, essentially. The "market" for nuclear power plants is so regulated as to prevent it from being "free" except to someone whose job depends on that market being "free".