Final answer:
The economic philosophy shared by Presidents Harding, Coolidge, and Hoover can be best described as laissez-faire. They believed in limited government regulation and favored capitalism, allowing businesses and markets to operate freely.
Step-by-step explanation:
The economic philosophy shared by Presidents Harding, Coolidge, and Hoover can be best described as laissez-faire. Laissez-faire economics is the belief that economic markets should operate without government intervention. During this period, the presidents believed in limited government regulation and favored capitalism. They promoted policies that allowed businesses and markets to operate freely without significant interference or control from the government.