Supply and demand. Memory is treated like a commodity on the stock exchange. When prices are too low, some companies don't survive. Prices are going up as demand increases. I remember standing in line to buy a 4 MB stick of ram for $100, which was cheaper than anything else at the time. That was about 15 years ago.
 

roonj

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Read this earlier this year, due to the economy and the excess inventories ram manufacturers stopped production. They waited till inventories reached 20% from the level they were at. This caused a perceived shortage, lower availability, higher prices. They all did this as a form of survival, interesting how competetors get together sometimes.