a) Why is the PPF curve bowed outward. Is it due to increasing opportunity cost or decreasing opportunity cost or constant opportunity cost b) What happens to the PPF curve during a recession? Will it...

a) Why is the PPF curve bowed outward. Is it due to increasing opportunity cost or decreasing opportunity cost or constant opportunity cost b) What happens to the PPF curve during a recession? Will it shift inward or outward or remains constant c) Suppose a technology is banned due to its adverse environmental impacts. Would the production possibilty curve shift inward or outward or remain constant due to this d) How will a policy encouraging more immigration would shift the production possibility forntier. It will shift inward or outward or remain constant