RAM prices going up again

RAM prices are on a rollercoaster. After a few weeks going down, DDR 400 chips have seen an increase in price of about 7.4% in a week. Other memory prices are following the trend. This movement seems to be caused by manufacturers that prepare their stocks for the back to school season.
This also confirms that the market is tensed; supply and demand being almost equal, the smallest variation makes the market go upside down.