Petrol card that has a fuel volume value (liters or gallons) rather than a cash value. So you could buy 500 liters today and use it over the coming months. You win because you have a hedge against price increases. The company wins because they essentially have a $750 interest free loan. Everybody wins!-- simonj, Jun 24 2010 Forever Stamp Fact Sheet http://www.usps.com...ver_stamp_facts.htmI believe that the current over-the-counter value of a Forever Stamp is $0.44 USD. So if you had bought a supply of the original stamps issued in 2007 at the original issue price of $0.41 each, then you would effectively have earned a 7.3% return on every stamp you used today. [jurist, Jun 24 2010] hyperinflation happens when people start buying things early in anticipation of future price increases.-- Voice, Jun 24 2010 So like a futures market for gasoline. Baked. Although I do like the idea of simplifying it for the general public.-- DIYMatt, Jun 24 2010 post office won't do it, transit companies won't do it, what makes you think oil companies will do it ?-- FlyingToaster, Jun 24 2010 [FT]://post office won't do it...// Actually, at least in the United States, that's one of the few examples of entities who *will* do it. If you buy the "Forever" stamps (identifiable by the Liberty Bell graphic) the stamp will cover basic rate first-class postage in perpetuity, regardless of any changes to the current basic rate. [link]-- jurist, Jun 24 2010 I believe if you buy a 1st class stamp here (UK) at current prices, it's pretty much a "forever" stamp but I could be wrong.-- po, Jun 24 2010 // Up to 72 stamps in one transaction! If I was rich, I would have taken advantage of this offer. Then Id be rich.// Just another example of Commander Sam Vimes' "Boots" Theory of Economic Privation.-- gnomethang, Jun 24 2010 This is a simple "yescroissant". No need to spend more words on it. If the oil companies refuse, we'll bring them before the Senate and question them.-- django, Jun 24 2010 Yes ! Put them in the Comfy Chair and prod them with the Soft Cushions !-- 8th of 7, Jun 25 2010 random, halfbakery