"If the recent yield curve panic proves anything, it proves that, in financial markets, what may start out as a mere statistical correlation, and possibly a spurious one, can become a genuine causal relationship. In particular, if enough people subscribe to a post-hoc fallacy, it may not stay a fallacy for long.
It was, therefore, just a matter of time before the discovery that inverted yield curves often anticipate recessions resulted in the world’s first yield-curve induced panic. And the distance between panic to recession is no great stretch. Knowing that the curve has turned turtle, and anticipating tumbling stock markets and shrinking incomes, the public rushes to trade stocks for more liquid assets, while banks tighten lending standards. Lo and behold, stocks do tumble, and incomes do shrink. A slowdown then threatens. Should the monetary and fiscal authorities fail to avert it, the slowdown can become a contraction. If the contraction lasts, it becomes a recession. And all this because the yield curve went concave. Post hoc ergo propter hoc. Really."