Tuesday, December 9, 2008

"Before this crisis is over, the two largest European central banks will engage in both quantitative and qualitative easing on a much larger scale."

Willem Buiter with a keeper for explanatory purposes:

"A short post for once! I propose the following taxonomy for measures the central bank may take, other than changing the official policy rate (the short risk-free nominal interest rate), changing reserve requirements or changing the exchange rate (where this is an instrument of monetary policy).

Quantitative easing is an increase in the size of the balance sheet of the central bank through an increase it is monetary liabilities (base money), holding constant the composition of its assets. Asset composition can be defined as the proportional shares of the different financial instruments held by the central bank in the total value of its assets. An almost equivalent definition would be that quantitative easing is an increase in the size of the balance sheet of the central bank through an increase in its monetary liabilities that holds constant the (average) liquidity and riskiness of its asset portfolio.

Qualitative easing is a shift in the composition of the assets of the central bank towards less liquid and riskier assets, holding constant the size of the balance sheet (and the official policy rate and the rest of the list of usual suspects). The less liquid and more risky assets can be private securities as well as sovereign or sovereign-guaranteed instruments. All forms of risk, including credit risk (default risk) are included.

The Fed is engaged in aggressive quantitative and qualitative easing. The Bank of England is engaged in reluctant quantitative and qualitative easing. The ECB has done less quantitative easing (proportionally) than the Bank of England or the Fed, but has engaged in quite a bit of qualitative easing - not by buying risky and illiquid private securities outright, but by accepting them as collateral in repos and at the discount window (its marginal lending facility).

Before this crisis is over, the two largest European central banks will engage in both quantitative and qualitative easing on a much larger scale."

Nick Rowe with a comment:

"Risk and liquidity, yes, but also I think duration of assets is important. “Operation Twist” for example, where the Fed bought long bonds and sold short bonds (both very liquid, having thick markets and small bid/ask spreads), should be included as an example of qualitative easing. And with long rates much higher than short rates, and possibly part of the current problem, including duration in your definition would make it more useful. Posted by: Nick Rowe | December 9th, 2008 at 1:21 am | Report this comment"

Buiter again:

"I agree that changes in the duration of the asset side of the central bank’s balance sheet, such as operation twist, can be interesting. So can changes in the currency composition of the asset side of the balance sheet, including sterilised foreign exchange market intervention. But I would characterise neither of these as ‘easing’.

Qualitative easing and quantitative easing can both be quasi-fiscal operations. They can be so ex-ante (the risk-adjusted rate of return to the central bank is below the safe rate) and/or ex-post - whatever the ex-ante risk pricing of the operation, the central bank may end up making a loss, for which ultimately the tax payer may be responsible."

And Nick Rowe again:

"Suppose the central bank changes the mix of assets in its balance sheet, leaving the total quantity constant. Under what conditions would this be qualitative easing rather than qualitative tightening?

Proposed answer: it depends on the relative interest elasticities of investment (and savings) with respect to the two types of assets it buys and sells, and on the relative interest elasticities of supply of those two types of assets. “Easing” means that the investment increases. “Tightening” means that investment decreases.

For example, if investment elasticity is higher wrt risky than safe assets, (and the supply elasticity is the same) then buying risky and selling safe assets is quantitative easing, because the net effect will be to increase investment.

Similarly, if investment is more elastic wrt long rates than short rates, then operation twist would be easing.

Posted by: Nick Rowe | December 9th, 2008 at 5:41 pm | Report this commentPosted by: Willem Buiter | December 9th, 2008 at 7:25 am | Report this comment"

1 comment:

Nick Rowe said...

Thanks Don.

A good taxonomy not only helps clarify communication, but also (I have belatedly realised, though perhaps other understood this all along) helps clarify one's own thinking.

Willem Buiter's post helped clarify my thinking on the quantitative vs. qualitative distinction, but he took for granted the tightening vs easing distinction.

For quantitative easing, the tightening/easing distinction is obvious, so nothing more needed to be said. But when he introduces qualitative easing, it's not obvious which operations are easing and which are tightening. (It's one of the payoffs to his taxonomy that it forced me to understand that this was a question that needed an answer).