Nothing would be left to the untidy devices of the free market. Wages and prices would be controlled by government fiat. A one-world fascist government would control every aspect of a world economy. Nothing would be left to the untidy devices of the free market. Wages and prices would be controlled by a central bank, fiat currency, and interest rate manipulations.
Fascist socialism is more subtle than communist socialism.
One form of tyranny has corporate logos pasted across the landscape, while the other has government logos pasted over the landscape. The Japanese pledge loyalty to the Corporation. The Cubans pledge loyalty to the Party. Corporate Earth will simply take a bit longer to build than Communist Earth because the fascists have learned from the mistakes of those heavy-handed commies and are now doing things with a lot more delicacy. Both allow corporations to exploit the cheapest labor market across national boundaries.