1. Improvements in technology.2. Increases in the supply (stock) of capital goods.3. Purchases of expanding output.4. Obtaining the optimal combination of goods, each at least-cost production.5. Increases in the quantity and quality of natural resources.6. Increases in the quantity and quality of human resources. Which set of items in the accompanying list would move an economy from a point inside its production possibilities curve to a point on its production possibilities curve?a. 1, 2, 5, and 6 only. b. 3 and 4 only. c. 1, 3, and 4 only. d. 3 only. More than 75% of the world's income is earned by what percentage of the world's population?a. 10%.b. 40%.c. 20%.d. 5%.