You are the type of person who is generally thinking about three different things at the same time. 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 going from convenience store to convenience store looking to buy either a set of luggage without wheels or a how-to book on wine tasting. Be on the lookout for vindictive digital clocks with revenge on their minds. You should consider shopping at stores or businesses beginning with the letter Y, but do not buy any products with a serial number or product code containing the number 546762. 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.

Colluding oligopolistic firms generally produce less output and charge a higher price than would be the case for a perfectly competitive industry. The efficiency of colluding oligopolistic firms is essentially the same as that for monopoly. In essence, colluding oligopolistic firms function just as if the market is a monopoly. The price charged by the colluding firms is higher than the marginal cost of production and the quantity is less. Most notably, price is greater than marginal, a violation of the key condition for efficiency.

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Dr. Nova Cain, DDS, has her office in the mini-mall just north of city hall. You know the sort of mini-mall. It has a branch of Interstate OmniBank, Smilin' Ted's All-Comers Insurance Agency, an auto parts store, a branch of the public library, and four chiropractors.

Dr. Cain's location near the Shady Valley City Hall is most fortunate. One of my back molars is beginning to shoot sharp pains through my eyeball, into my brain, and out the back of my head. I've been meaning to stop by for a cleaning and check up, but, well, the thought of sharp needles and high-speed drills grinding away large portions of my teeth convinced me that other activities were more important.

Now, however, just as we're trying to trek through the complexities of the economy, that back molar has decided to throb incessantly. It's best if I stop in and let the kind and (hopefully) gentle Dr. Cain check it out.

Guess what? ROOT CANAL!
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-- Don Greene, motivational coach, former Green Beret

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