A study by AARP of 514 brand name and generic drugs between 2005 and 2009, shows that generic drug prices went down an average of 31% during this period, and brand name drug prices went up by 41%. One of the authors of the report says that it is important to look at individual drug prices and not studies showing total spending on drugs, because this is a significant cost for people paying out-of-pocket, It drives up insurance premiums, and pushes retirees into coverage gaps in Medicare Part D drug program. Analysts indicate pharmaceutical companies are increasing prices on drugs before patent expiration to get as much profit before the patents expire.