 Another factor that decreased the popularity of pies was industrialization and increasing movement of women into the labour market, which changed pie making from a weekly ritual to an "occasional undertaking" on special occasions.In the 1950s, after WWII, the popularity of pies rebounded in the US, especially with commercial food inventions such as instant pudding mixes, Cool Whip topping, and Jello gelatin (which could be used as fillings) ready-made crusts, which were sold frozen, and alternative crusts made with crushed potato chips.There was a pie renaissance in the 1980s, when old-fashioned pie recipes were rediscovered and a wide range of cross-cultural pies were explored.