Stimson here supports Roosevelt’s belief that the best way to rapidly mobilize an economy is through ____ to companies.

Verified Answer :

They both believed that the best way to rapidly mobilize an economy is through incentive to Companies

This incentive will be used for various operational expenses that will help the companies to expand

And eventually will bring out more National income for the country

Neuron

Stimson supports Roosevelt's belief that the best way to rapidly mobilize an economy is through industry to companies. 

He thought that creating industry was a very important aspect and that it was necessary for a nation to have one which is supported through companies.