Forever Stamps are always sold at the same price as a regular First-Class Mail stamp. The Postal Service developed the Forever Stamp for consumers ease of use during price changes. Forever Stamps are available for purchase at post offices nationwide, online at usps.com, and by phone at 1-800-STAMP-24 (1-800-782-6724).
Production Possibility curves. The production possibility curves is a hypothetical representation of the amount of two different goods that can be obtained by shifting resources from the production of one, to the production of the other. The curve is used to describe a societys choice between two different goods. Figure 1, shows the two goods as consumption and investment.
Moving along the production possibilities curve, the slope becomes steeper (that is, the absolute value of the slope increases), reaching a value of -200 (an absolute value of 200) between points J and K. This reflects the law of increasing opportunity cost and results in the convex shape for the production possibilities curve. Three Curves Three alternatives help to illustrate the connection between opportunity cost and the shape of the production possibilities curve. 1  Convex: Increasing Cost (Click the [Convex] button): This is the standard convex production possibilities curve with increasing opportunity cost. Because it best reflects the economy, it is the one most commonly seen throughout the study of economics. In this case the economy foregoes increasing amounts of one good when producing more of the other.