Manufacturers may have been artificially inflating DRAM prices by restricting supply and agreeing to not cannibalize the market share of others. The abnormal rise in revenue by as much as 166 percent YoY has caused at least one U.S. law firm to investigate further into the matter with correlative results.
https://www.notebookcheck.net/Samsung-Micron-and-Hynix-control-96-percent-of-DRAM-market-now-accused-of-price-fixing.301652.0.html