The US has had two huge bull markets since the end of WWII; ’46-’66 and ’82-’00. Each time there was a positive shock to the economy. The 1st bull market resulted from baby boomers and the creation of the Interstate highway system. The 2nd resulted from a 20 year decline in interest rates and the Internet. The rest of the time (’67 to ’81 from ’00 to ’11) the economy essentially stagnated. What is next?