Before the institution of the Grand Exchange, inflation and deflation caused some instability in the game economy of runescape. Inflation was caused by the large number of resources put into the game by macroing. Deflation occurred when more expensive items, such as certain weapons and armour, lost value over time because they became more prevalent and because newer items were introduced. Typically there was a huge impact on the day new items were released, with prices in the tens of runescape millions for the first few hours, and then decreasing to a few million by the end of the day. The prices of rare items (items that were released in RuneScape Classic for holidays and can no longer be attained by any means other than buying from another runescape player) tend to increase over time. For example, party hats were relatively cheap when they were released and are now worth hundreds of runescape millions.