This article is from the Anime Music FAQ, by Ru Igarashi with numerous contributions by others.
The so-called 2 year limit refers to the regulation period that the first release price lasts (for "price protection"). After that period expires, retailers can reduce the price.
Some people are under the impression this period refers to when the CDs are forced out of print. They are totally wrong. Anime CDs have a limited market viability, so by coincidence, some anime CDs go out of print in 2 years. But some remain in print longer than that.
 
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