Learning Contents:   ·          Basic Properties of PPC   ·          Attainable and Unattainable combinations of output ·          Potential and Actual   level of output on PPC Basic Properties of PPC 1. Production Possibility Curve slopes Downward The slope of the Production Possibility Curve is downward from left to right that indicates that the economy can produce more of one commodity only when the production of other commodity is sacrificed as the resources are limited. In other words, the Production of both goods cannot be increased. More of Good-X can be produced only with less of Good-Y. 2. Production Possibility curve is concave to the point of origin The shape of PPC is concave to the point of origin or bowed outwards because of the increasing marginal opportunity of cost. The increasing marginal opportunity cost means for every additional unit of a good, the sacrifice of another unit of good increases. The opportunity cost tends to increase as resources are used- s