An exchange-traded tracker like iShares Inflation Protected Securities (( TIP )) or a mutual fund like the Vanguard Inflation Protected Securities ( VIPSX ) would have done close to a comparable index at 5.5%. Some of the more alarming valuation tools - market cap-to-GDP ("Buffett Indicator"), Cyclical P/E 10 (Shiller CAPE) - forewarn of the strong potential for a third 50%-plus decline for U.S. stocks in the 21st century. Jeff Gundlach of DoubleLine Funds fame recently highlighted the probability that corporate debt as a function of economic growth (( GDP )) is topping out.