The increase in chicken consumption during the last century is amazing. Over the years chicken prices have fallen and chicken quality has vastly improved. I am guessing the rise in beef consumption is due to rising income, beef production technologies, but also the change in food culture such as the integration of the hamburger into American society. There have not been many new pork products like there have been beef products, but people still like pork and technological progress has allowed pork prices to remain low, keeping its consumption fairly stable. Egg consumption has fallen over the years, despite the large decrease in egg prices (see this graph). This article provides an interesting discussion about egg consumption, arguing health concerns are a main reason for its decline in consumption, but also arguing those concerns are both false and dissipating.