Concept:A production possibility curve (PPC) shows the maximum output an economy can produce using all its resources fully and efficiently.
Explanation:Any point inside the PPC means the economy is not using all its available resources.
This indicates idle resources, inefficient production, or unemployment of labour and capital.
A point on the curve means full employment of resources.
A point outside the curve is unattainable with current resources.
Therefore, unemployment of resources occurs when production is within the PPC.
Answer:A. within the production possibility curve