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It's the first time I've run across the term "Gresham's Dynamic"; it very clearly captures a concept I've been trying to explain to explain in my own words, albeit applied to a wider topic. Is the use of the phrase limited to discussions about economies?

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There's a similar term "lemon market", for markets where the bad drives out the good.

http://en.wikipedia.org/wiki/The_Market_for_Lemons

Heh... I've noted an example of a lemon market recently: blenders.

Try buying a consumer-grade blender. It will break in under a year. You have to buy commercial grade (e.g. Vitamix) or don't bother. All the consumer-grade blenders on the market are junk.

Treadmills are like this too.

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