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Commerce Theory is a technology in the Final Frontier mod for Civilization IV: Beyond the Sword.


Commerce Theory allows the construction of the ultimate Star System-defending Planetary Defense Ship and the Spaceport Building, which increases the Commerce produced by the Star System in which it's built.

Civilopedia entry[]

Perhaps in backlash to the economically-disinclined growth of Green Economic theory, Commerce Theory sprung up on many worlds, emphasizing the development and usage of capital as the primary impetus of human progress. Spaceports became the new "laboratories" of Commerce Theory, pushing the boundaries of all previous economic thought. Many fortunes were created in this period, but one of the most concrete projects borne of Commerce Theory's deep pockets was the refinement of the class Planetary Defense Ship, with the purpose of protecting the investments of the rapidly growing commercial class.