What do record amounts of corporate debt, a continuing rally of American stocks and a precipitous decline in commodity prices all have in common? Investors. 

Marilyn Cohen of Envision Capital Management says low interest rates have been great for bond sellers and haven’t scared away bond buyers. Alex Bryan at Morningstar investment research says commodities are a different story – with oil falling, they look a little scary right now. And Quincy Krosby, a market strategist for Prudential Financial,  says the portfolio rebalancing that happens between these asset classes also happens between stocks, at the end of every year.