Which of the following implies concavity of PPC?

Increasing slope     

The Correct Answer is option 3: Increasing slope   

Here's why:

• The Production Possibility Curve (PPC) depicts the trade-off between producing two goods (e.g., shirts and sandals) with limited resources.
• Concavity of the PPC signifies that as you move along the curve and choose to produce more of one good (e.g., sandals), the amount of the other good (e.g., shirts) you have to sacrifice increases at an accelerating rate.
• This increasing sacrifice is reflected in the increasing slope of the PPC as you move from left to right. It highlights the concept of increasing marginal opportunity cost (MOC).