We’ve all heard the cliché “all good things must come to an end,” which has been bandied about with slight variations since Chaucer penned the “Canterbury Tales.” Although many investors may not want to believe it, it is very possible that we’re approaching that point with the current bull market.

An old Grateful Dead song provides an appropriate synopsis of the market environment in which U.S. investors find themselves today. There’s a line in the old Grateful Dead song Truckin’ – “Lately it occurs to me what a long, strange trip it’s been” – that I think is an appropriate synopsis of the...