Slate has a great article explaining why you’ll never get rich investing in “forever” stamps. It sounds like a good idea, right? Postage stamps keep increasing, so if you buy a “forever” stamp, you’ve locked in your 41-cent rate for eternity. Slate explains the problem with this “investment strategy”:

Since 1971, postal rates have increased more slowly than the actual inflation rate, as measured by the U.S. Consumer Price Index. So, despite the numerous rate hikes over the last 36 years, stamps have actually been getting cheaper. The 20-cent stamp from 1981, for instance, would be equivalent to 45 cents in today’s dollars—which makes today’s rate 10 percent cheaper than it was 26 years ago. Should this historical pattern hold, you’d be paying more for today’s forever stamps than you would for any stamp in the future, no matter how high the rate goes.

In fact, this pattern must hold—as a matter of law. In December, President Bush signed the Postal Accountability and Enhancement Act, which ensures that future price increases will be kept below an inflation-based ceiling. In other words, postage hikes will never surpass inflation—and the forever stamp will never become a good investment.

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