Since then the manipulated equity market bubble has gone straight up with every single dip bought massively by the algos, in the process surely eliminating any nervous thoughts Tepper may have had. So in a world starved for pundit philosophy, Bloomberg just reported that the bond market bubble is about to pop, at least according to the folicularly challenged billionaire. The reason, paradoxically enough, the ECB's decision to monetize private assets and cut rates.
Empirically, Tepper may be right: in the past every time a central bank has launched a massive easing program (think QE1, QE2, Twist, QE3, etc.) it resulted in aggressive stock buying offset by bond selling. The issue is when said programs came to an end, and led to major selloffs in equities, pushing bonds to newer and lower record low yields.