See International Medical Products Price Guide for details about the guide and the two kinds of prices: buyer and supplier prices. The Price Guide Price Sources page states that buyer prices "are included for information purposes" and "should not be used as international reference prices". In the WHO/HAI price/availability survey methodology, how representative reference prices are generally depends on the number of suppliers quoting for each product. Some suppliers are international but others serve only a small region of one country. The MSH Price Guide was updated annually, but has not been updated since 2015.