Khan Academy: Pp Cs for Increasing, Decreasing and Constant Opportunity Cost

The shape of a production possibility curve [PPC] reveals important information about the opportunity cost involved in producing two goods. When the PPC is a straight line, opportunity costs are the same no matter how far you move along the curve. When the PPC is concave [bowed out], opportunity costs increase as you move along the curve. When the PPC is convex [bowed in], opportunity costs are decreasing. [5:25]