You are the type of person who can see the solutions to problems when others fail even to see the problems. Family and friends get irritated when you explain, for the umpteenth time, the difference between a partial derivative and a total derivative. Today, you are likely to spend a great deal of time looking for a downtown retail store hoping to buy either a coffee cup commemorating last Friday (you know why) or a wall poster commemorating the first day of spring. Be on the lookout for bottles of barbeque sauce that act TOO innocent. You should consider shopping at stores or businesses beginning with the letter U, but do not buy any products with a serial number or product code containing the number 774342. Your preferred shopping venue is the Internet. Your special symbol is the exclamation point (!).

As a Purple Smarphin, you are the brightest and most intelligent person you know. And that goes for shopping, too. You know exactly what you want. You know exactly what it costs. You know exactly when and where to buy. But, of course, shopping is only one of the many activities that attracts your intellectual attention. You shop when you need to and buy if have to, but shopping is not the end all of your life.

The change in the quantity of total product resulting from a unit change in a variable input, keeping all other inputs unchanged. Marginal product, usually abbreviated MP, is found by dividing the change in total product by the change in the variable input. Marginal product, which occasionally goes by the alias marginal physical product (MPP), is one of two measures derived from total product. The other is average product.

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Our pedestrian's jaunt through the economy is not, unfortunately, an unrestrained shopping spree for confectioneries, spark plug tools, and Houston, Texas. We have other important errands to run. At the moment we need to hike over to Shady Valley's exclusive provider of cable television services, the Merciless Monolithic Media Masters Cable Television Company, Inc., to inquire about a mysterious fee that appeared last month's bill.

The good news is that the Merciless Monolithic Media Masters (the 4M people) Cable office is a mere 2 miles (3 kilometers for the metrically inclined) from the Shady Valley Central Town Sprawling Hills Shopping Mall. A hop, skip, and a moderately long jump later, our excursion through the economy takes us to the front door of the 4M Cable Television Company where I hope to discover why last month's cable bill included a $3,569 charge for something called "The Vacation Channel." I didn't even know I had a vacation channel. (But, I'm sure it's a great channel, and if I don't have it, then I will certainly subscribe. Please don't disconnect me.)

Of course, because this an afternoon workday, the doors of the 4M office are locked. I can almost make out, through the expensive stained glass windows, what appears to be several Merciless Monolithic Media Masters Cable Television employees, with champaign bottles in hand, dancing on expensive mahogany desks. Let's not disturb them. As they say in the cable business, an upset worker is a disconnected customer.
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