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Showing posts from February, 2011

Sunk Costs, Marginal Costs and Economics

When I was in college, I hated Economics. Then, several years later, I found myself teaching undergrad Econ and learned an appreciation for it. Now today, I have an even bigger appreciation for it. I have also noticed that not enough people have a solid grasp of some basic econ concepts that can be applied to everyday life. Two of these are cost related. Here are some basic definitions from The Economist website : Sunk Costs - When what is done cannot be undone. Sunk costs are costs that have been incurred and cannot be reversed, for example, spending on ADVERTISING or researching a product idea. They can be a barrier to entry. If potential entrants would have to incur similar costs, which would not be recoverable if the entry failed, they may be scared off. Marginal Costs - The difference made by one extra unit of something. Marginal revenue is the extra revenue earned by selling one more unit of something. The marginal cost (or whatever) can be very different from the AVERAGE c