Nobel 2013: Fama, Shiller, and Hansen

Yah, Nobel prize.  All guys that deserved it … I just wouldn’t have expected them to get it together.  To be honest, the reasoning makes sense though – they have all added significantly to the empirical analysis of asset prices, albeit in quite different ways :)

Still, don’t read me.  Read Cochrane (here, here, herehere, here).  And Marginal Revolution (here, here, here, here, here, here).

Also I enjoyed this.  And this post on why the Chicago school gets so many Nobel laureates is a good counter-measure to all the arbitrary bile that can be thrown around on the interwebs :) .  I also enjoyed this post from Noah Smith.

I have a bias towards Shiller in all of this because of my interests.  He is a big proponent of trying to view economic phenomenon through a lens of history dependence (with the regulatory difficulties that entails) and has talked about how exciting neuroeconomics is – completely agree.  However, this has nothing to do with empirical finance in of itself, as this is not my field.  While I think some of the stuff is pretty cool (and remember really like GMM a few years back) I have nothing to say.  Hence why you should be going back and clicking those links to Cochrane and Marginal Revolution ;)

RBNZ misstep on macroprudential policy

I was hesitant to write this post, until I realised I was writing it on a personal blog that only a few lovely people read and no-one will be too concerned with what I say :) .  Then I decided I may as well discuss how I actually feel about the speech from the RBNZ yesterday (where we discussed the summary here).

Not so long ago I wanted to note how to think about the causes of why we may move towards LVRs (maximum loan-to-value ratios on mortgage lending) in New Zealand.  I noted the following in terms of some quotes they had made:

Either these quotes miscommunicate the justification the Bank is using for such policies, I have completely misinterpreted the quotes, or they communicate it perfectly and I fundamentally disagree with the association they are using.

It is now clear that the RBNZ’s communication is crystal clear, and I fundamentally disagree with an element of their justification for LVRs.

Read more

LVRs are coming!

The RBNZ has now officially announced maximum loan-to-value ratios (LVRs) for the public in a speech here.

They noted that the run up in house prices has increased the probability of a sharp decline in house prices – an event that may in turn lead to instability in the New Zealand financial system.  Their thinking is:

“The LVR restrictions are designed to help slow the rate of housing-related credit growth and house price inflation, thereby reducing the risk of a substantial downward correction in house prices that would damage the financial sector and the broader economy.”

In this way it is pre-emptive – current credit growth is moderate, but they want to ensure they don’t lose control of credit growth in a way that makes the entire financial system (which is implicitly insured by government) fragile.

The Bank makes a specific point of saying that the concern is around mortgage borrowing, and a run up in house price expectations associated with already realised increases in house prices, that they are targeting with macro-prudential policy – as unlike an increase in the OCR which is targeted at broad demand, it is a specific lift in demand for housing that is driving current house price appreciation.  It is not that NZ households have become more willing to spend per se – the concern is that NZ households, and the banks willingness to lend to households, is focused excessively on housing assets.

I will admit that I am not completely sold on the argument they have put forward for LVRs, and I’m perplexed at why they are communicating it by discussing house prices (thereby mixing it with issues of affordability for the public) rather than simply stating that they are of the view that banks are taking on too much risk in terms of mortgage assets at present.

But they have clearly laid out their argument, and they have made sure that they communicate it rather than just doing it.  And this is great – I am alway impressed by how transparent our central bank is!  I think that this helps them when it comes to introducing specific, one-off, policies such as the current LVR limts.

If we have a bank tax, make it a deposit levy

I argue the deposit levy point (as a form of insurance) here.

The only point I have to add is that some may say “why charge poor old depositors”.  I’d note here that we need to think about the “incidence of tax” – if it is true that depositors have no market power, then the entire burden of the tax will fall on banks and borrowers.

This is all part of a broader debate on deposit guarantees (here, here) – if we rule them out, we rule out the justification for a levy as well.  I’d add there is a big issue I haven’t touched – what is our ability to limit deposit insurance given concerns about “bank stability”, and what do we do when banks are just too big (think Ireland and Iceland).  My real desire is to see transparent, and credible, ex-ante policy … and to be honest about the trade-offs we are facing and accepting.

Either way, my focused has switched back to methodology issues as I’ve realised I need to intensify work on my NZAE paper this year (posts here and here) … in case they actually decide to accept the abstract I’ve just submitted.  As a result, when I next get a chance to sit down there are two posts I want to write about assumptions, and then I might start blogging some of the background material I’ve already written about for the paper.

However, knowing me I’ll just start ranting about whatever I see in the paper instead ;)

Looking for stock advice? Buy a cat…

Via @NBR I came across this awesome article on the Guardian about a cat named Orlando that was pitted up against some investment professionals and students in a stock picking challenge. How did the cat pick stocks?

While the professionals used their decades of investment knowledge and traditional stock-picking methods, the cat selected stocks by throwing his favourite toy mouse on a grid of numbers allocated to different companies.

And the results? Orlando the cat unsurprisingly (to anyone who has studied finance and whose job isn’t giving investment advice) earned more money than the professionals.

At least the kids didn’t beat the pros, that would be embarrassing if they did….

Anomalies and market efficiency

Tim Harford points to a paper on the EMH showing that:

…after an anomaly has been published, it quickly shrinks – although it does not disappear.

The anomalies are most likely to persist when they apply to small, illiquid markets – as one might expect, because there it is harder to profit from the anomaly.

It’s always good to remind ourselves that all anomalies are only fully priced in equilibrium, and we’re probably never in equilibrium. The process of moving towards equilibrium involves market participants seeking out those anomalies and exploiting them. So the continued discovery of new market anomalies isn’t evidence against market efficiency: it’s merely observation of the normal equilibrating process.