Any item used as money in an economy automatically takes on four basic functions: (1) medium of exchange, (2) unit of account, (3) store of value, and (4) standard of deferred payment. While "buying and selling" means that money is THE medium of exchange, and by far THE most important function of money, money also performs unit of account, store of value, and standard of deferred payment functions.

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Mona Mallard Duct Tape Industries, the world's a leading producer of duct tape (that all-purpose, omni-present, shiny gray tape), is located right here in Shady Valley. Perhaps you've heard that they recently developed a new-fangled form of duct tape that's certain to revolutionize duct tape as we know it. This revolutionary development has, however, created a "situation" that we, pedestrian explorers of the economy, should consider. Mona Mallard's new duct tape uses "quagliminium," a relatively limited mineral found only in the quaint and courteous Republic of Northwest Queoldiola. Prior to this duct tape development, quagliminium had only one use, as lubricant for OmniStraight shoestring straighteners. The Northwest Queoldiolan supplies were sufficient to lubricate shoestring straighteners well into the year 3000. As a duct tape input, though, quagliminium deposits will be exhausted in a scant 50 years. Should we, could we, allow Mona Mallard to exhaust the supply of quagliminium? If they do, how will future generations lubricate their shoestring straighteners? Should we call for a moratorium on quagliminium use?
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Today, you are likely to spend a great deal of time at a crowded estate auction hoping to buy either a black duffle bag with velcro closures or any book written by Isaac Asimov. Be on the lookout for small children selling products door-to-door.
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