42. Economics deals primarily with the concept of a. scarcity. B. poverty. C. change. D. power 43. Approximately what percentage of the worldquot;s

42. Economics deals primarily with the concept of a. scarcity. B. poverty. C. change. D. power 43. Approximately what percentage of the world"s economies experience scarcity? A. 25% b. 50% c. 75% d. 100% 44. Factors of production are a. the mathematical calculations firms make in determining their optimal production levels. B. social and political conditions that affect production. C. the physical relationships between economic inputs and outputs. D. inputs into the production process.