It's notable how large the increases in the extra-ounce and postcard rates are, compared to the unexpectedly small increase in the Forever stamp rate.
Here's a chart showing how the extra-ounce and postcard rates have changed over time, as percentages of the one-ounce letter rate. It's interesting how dramatically the extra-ounce rate has fallen in the past half-century, and how that trend has reversed in the past few years. I wonder what that tells us about the changing economics of mail handling....
