Sunday, May 17, 2009

what we really need is a model that can produce a Minsky moment — the point at which margin calls force deleveraging

From the NY Times:


May 17, 2009, 7:59 pm

The night they reread Minsky

Brad DeLong offers a neat little model of speculative fluctuations in asset prices, based on the idea that investors gradually switch strategies based on what seems to work for other people: if people buying stocks seem to be doing well, more people move into stocks, driving up prices and making stocks look even more attractive. It’s very close to Shiller’s notion of bubbles as natural Ponzi schemes. And Brad’s version is very much what I was saying in this piece written in 1999 — one I had a lot of fun writing.

What’s missing, as Brad himself points out, is the asymmetry of booms and crashes. What he doesn’t say is that what we really need is a model that can produce a Minsky moment — the point at which margin calls force deleveraging.

I’ll be giving the Robbins Lectures at the LSE next month. The title of this post is also the title of my third lecture. I hope I actually have a model by then …"

Me:

Why not ask why investors panicked after Lehman? Why not ask why China began selling Agencies and buying Treasuries at the time of Fannie/Freddie? It seems that one hypothesis is that investors began to doubt the US govt’s commitment to guarantee assets, even its own.

The Calling Run began as a Flight to Quality/Liquidity/Explicitly Guaranteed assets, because the investors wanted to get their money into these investments. It seems to me that the Flight was a response to uncertainty, not actual calls. In that sense, it was proactive. But, as Fisher’s model predicts, this has a cascading effect, leading to proactive cuts in jobs, loans, investments, etc., and, finally, to a savings spree by consumers.

The moment that you know will be when some investors, like China, begin a Flight to Safety, moving even out of implicitly guaranteed government investments. This is a very bad sign, since they are losing money on bonds that are govt guaranteed, unless there’s actual deflation or a govt imposed haircut on implicitly govt guaranteed bonds.

This will tell you that you are at the Calling Run point unless you take appropriate actions. There is no better model since it will take real world investment decisions to let you know that you’ve reached the fail safe point.

— Don the libertarian Democrat

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