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January 27, 2026 

AmosWEB means Economics with a Touch of Whimsy!

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LERNER INDEX: The difference between price (p) and marginal cost (mc) as a fraction of price, that is [p-mc]/p. The Lerner index is usually taken as an indicator of market power because the larger the index, the larger the difference between price and marginal cost, that is, the larger the distance between the price and the competitive price. The Lerner index depends on the elasticity of demand. The Lerner index is also called the price-cost margin.

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AVERAGE REVENUE, MONOPOLISTIC COMPETITION

The revenue received for selling a good per unit of output sold, found by dividing total revenue by the quantity of output. Average revenue often goes by a simpler and more widely used term... price. For a monopolistically competitive firm average revenue is greater than marginal revenue. Average revenue for a monopolistically competitive firm is often depicted by a negatively-sloped average revenue curve.

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Charging Up Your CREDIT CARDS (aka Plastic Money)

Here's the scene: You've made your monthly stop (for the second time this week) at the Mega-Mart Discount Warehouse Super Center for a few essentials -- cashews, soap, licorice, garden hose, peanut clusters, color television, and a large inner tube for whitewater rafting. Do you pay with a check or whip out your Interstate OmniBank Platinum Diamond Express credit card? Credit card? Good choice. You don't actually have to PAY for the stuff that you're buying -- at least not right away. Your bank account is safe.
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WHITE GULLIBON
[What's This?]

Today, you are likely to spend a great deal of time going from convenience store to convenience store looking to buy either a birthday greeting card for your grandmother or a coffee cup commemorating yesterday. Be on the lookout for the last item on a shelf.
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This isn't me! What am I?

In his older years, Andrew Carnegie seldom carried money because he was offended by its sight and touch.
"Don't judge each day by the harvest you reap, but by the seeds you plant."

-- Robert Louis Stevenson, Author

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Increasing Absolute Risk Aversion
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