I've never understood the global shortage of safe asset meme. I'm willing to be educated. I know that Ricardo Caballero and Gary Gorton have written about the safe asset shortage problem. In the blogosphere it pops up in David Beckworth and David Andolfatto , and the folks at FT Alphaville can't talk about much else. First, there seems to me to be definitional issues. What is a safe asset? Beckworth, for instance, describes them as "those assets that are highly liquid and expected to maintain their value." But liquidity and riskiness are separate concepts. There are many financial instruments that are very liquid yet risky—take the S&P mini futures contract, the most liquid futures contract in the world. There are many low-risk instruments that are illiquid—a 5 year non-cashable Canadian GIC being a good example. How are we to reconcile these oppositions into one definition? Second, it seems to me that the concept of a safety is misspecified. How do we go...