Check the correct economic theory (ies) that best fits the following statement: Prices are determined solely by the amount of Labor and inputs that go into the production of those goods and services. Select one or more: O a. Classical b. Keynesian c. Marxism d. AustrianCheck the correct economic theory (ies) that best fits the following statement: The economy works best under a "Laissez-Faire" approach. Select one or more: O a. Marxism O b. Austrian O c. Keynesian O d. Classical