Archive for the 'USA' Category

Double-yolk eggs, clustering and the financial crisis

Published on 3 February 2010 in Economics, Epistemology, Finance and USA. Tags: , , , , , . 0 Comments

I happened to be listening when Radio 4’s “Today Show” had a little debate about the probability of getting a pack of six double-yolk eggs.  Tim Harford, who they called to help them sort it out, relates the story here.

So there are two thinking styles here. One is to solve the probability problem as posed. The other is to apply some common sense to figure out whether the probability problem makes any sense. We need both. Common sense can be misleading, but so can precise-sounding misspecifications of real world problems.

There are lessons here for the credit crunch. When the quants calculate that Goldman Sachs had seen 25 standard deviation events, several days in a row, we must conclude not that Goldman Sachs was unlucky, but that the models weren’t accurate depictions of reality.

One listener later solved the two-yolk problem. Apparently workers in egg-packing plants sort out twin-yolk eggs for themselves. If there are too many, they pack the leftovers into cartons. In other words, twin-yolk eggs cluster together. No wonder so many Today listeners have experienced bountiful cartons.

Mortgage backed securities experienced clustered losses in much the same unexpected way. If only more bankers had pondered the fable of the eggs.

The link Tim gives in the middle of my quote is to this piece, also by Tim, at the FT.  Here’s the bit that Tim is referring to (emphasis at the end is mine):

What really screws up a forecast is a “structural break”, which means that some underlying parameter has changed in a way that wasn’t anticipated in the forecaster’s model.

These breaks happen with alarming frequency, but the real problem is that conventional forecasting approaches do not recognise them even after they have happened. [Snip some examples]

In all these cases, the forecasts were wrong because they had an inbuilt view of the “equilibrium” … In each case, the equilibrium changed to something new, and in each case, the forecasters wrongly predicted a return to business as usual, again and again. The lesson is that a forecasting technique that cannot deal with structural breaks is a forecasting technique that can misfire almost indefinitely.

Hendry’s ultimate goal is to forecast structural breaks. That is almost impossible: it requires a parallel model (or models) of external forces – anything from a technological breakthrough to a legislative change to a war.

Some of these structural breaks will never be predictable, although Hendry believes forecasters can and should do more to try to anticipate them.

But even if structural breaks cannot be predicted, that is no excuse for nihilism. Hendry’s methodology has already produced something worth having: the ability to spot structural breaks as they are happening. Even if Hendry cannot predict when the world will change, his computer-automated techniques can quickly spot the change after the fact.

That might sound pointless.

In fact, given that traditional economic forecasts miss structural breaks all the time, it is both difficult to achieve and useful.

Talking to Hendry, I was reminded of one of the most famous laments to be heard when the credit crisis broke in the summer. “We were seeing things that were 25-standard deviation moves, several days in a row,” said Goldman Sachs’ chief financial officer. One day should have been enough to realise that the world had changed.

That’s pretty hard-core.  Imagine if under your maintained hypothesis, what just happened was a 25-standard deviation event.  That’s a “holy fuck” moment.  David Viniar, the GS CFO, then suggests that they occurred for several days in a row.  A variety of people (for example, Brad DeLong, Felix Salmon and Chris Dillow) have pointed out that a 25-standard deviation event is so staggeringly unlikely that the universe isn’t old enough for us to seriously believe that one has ever occurred.  It is therefore absurd to propose that even a single such event occurred.   The idea that several of them happened in the space of a few days is beyond imagining.

Which is why Tim Harford pointed out that even after the first day where, according to their models, it appeared as though a 25-standard deviation event had just occurred, it should have been obvious to anyone with the slightest understanding of probability and statistics that they were staring at a structural break.

In particular, as we now know, asset returns have thicker tails than previously thought and, possibly more importantly, the correlation of asset returns varies with the magnitude of that return.  For exceptionally bad outcomes, asset returns are significantly correlated.

Party discipline in the Republican Party

Published on 3 February 2010 in Australia, Politics and USA. Tags: , , , , , , . 1 Comment

Inspired by this post by Cam Riley … Any observer of U.S. politics could not have failed to notice the incredible level of party discipline that the Republicans, particularly in the Senate, have achieved over the last year or six.  This may be something new to Americans, but it’s rather common to Britons and Australians, who generally get more excited when somebody — anybody! — breaks the party line.  The party discipline of the Australian Labor Party, in particular, is phenomenal.

I understand that the generally accepted explanation for the differences between the USA and Australia in this regard focuses on the sources of funding for campaigns.  In Australia, all campaign funds come from the party — individual candidates cannot raise money directly — where as in the US, there’s a combination of party-supplied and individually-raised funding.

That then suggests two possible reasons for the new-found Republican discipline:

  • Republican congressional candidates have started to take a larger fraction of their total campaign funding from the party itself; and/or
  • Advocacy groups that support policies we stereotypically associate with the Democratic Party have not been giving any money to Republicans.

If it is the second reason, then that is a tactical error, and a foolish one, on the part of those advocacy groups.

A blast from the past

Published on 26 January 2010 in Economics, Finance, Justice/Law and USA. Tags: , , , , , . 0 Comments

Back in June of 1987 (!), the New York Times interviewed Edward W. Kelley Jr. just as he joined the Federal Reserve’s board of governors.  How’s this for a quote?:

Q. Mr. Volcker has been considered something of a foot-dragger on bank deregulation. Where do you stand?

A. I’m philosophically in favor. The deregulation we’ve had over the last few years has been highly beneficial and I would favor further deregulation of the financial services industry. But there’s an overriding public interest in making sure the integrity of those types of institutions is maintained. I really do not want to run any meaningful risks that we deregulate at a speed or in a way that would imperil that.

Brilliant!

[Hat tip to my new favourite blog (ok, so I'm two years behind the times), Economics of Contempt]

Obama’s (i.e. The Volcker) bank plan

Published on 25 January 2010 in Economics, Finance, Justice/Law, Politics and USA. Tags: , , , , , . 0 Comments

Those of us who aren’t American but still follow U.S. politics were quietly giggling (okay, openly guffawing) into our latte’s last week when Scott Brown won the special election to replace the late Ted Kennedy.  The Daily Show’s take on the whole affair (I think it was broadcast the night before the election day) was spot on and I urge anyone with the capability to hunt down that episode.  In short, the Democrat’s handling of the event is a classic example of why the word clusterfuck was invented. What in blazes they now intend to do in passing any reasonable kind of reform in health-care (and the ideas on the table weren’t really all that reasonable to start with) is beyond me.

Anyway.  I tip my hat to the newest federal Senator in the United States for an expertly handled campaign.

I was then surprised to (finally) see some equally smart politics from the White House in the form of Obama publically supporting the banking regulation ideas of former Fed chair and octogenarian, Paul Volcker.

The White House had already been making noises about imposing a fee on financial institutions to recoup any losses in TARP.  TARP, if you remember, is the US$700 billion officially set aside under president Bush Jr. to help the finance industry weather the storm.  Of course, a large fraction of TARP was diverted to help the car (that’s “auto” for any Americans in the audience) industry and not all assistance to the financial industry was included in TARP.  Still, it’s the closest thing to an easy target with a pronounceable name.  If you care, you can read my incredibly brief thoughts on the levy here and, more importantly, here.

But the Volcker plan is an entirely different kettle of fish and can be boiled down to a simple and beautiful phrase:  “Too big to fail is just too big.”

It calls for constraints on the scope and the size of US banks.  It seeks to ban proprietary trading at institutions that hold retail deposits.  It’s an armchair commentator’s wet dream come true!  It’s also, unfortunately, staggeringly unlikely to ever become reality.  There are two reasons for this.

First, as expertly described by the Economics of Contempt, the White House has no intention of pushing this through anyway.  Instead, it was …

… a fairly transparent political stunt — the White House needed to do something to take the media’s focus off of health care 24/7, so they flew in Volcker and announced some proposals that sound good to the media. The two Senate staffers I talk to regularly both said their offices were basically ignoring Obama’s proposals, because even if the White House fights for them (which they won’t), Chris Dodd has no intention of inserting them into his committee’s bill. I like how some people think Obama’s proposals represent a fundamental turning point on financial reform, because….well, clearly this is their first rodeo. (Hence the uber-quixotic language they use to describe financial reform.)

[Update: Just to clarify, when I said Obama's announcement was a "fairly transparent political stunt," I wasn't criticizing the Obama administration. We live in a political world, and political stunts are often useful. If I were Rahm Emanuel, I'd be a dick have done the same thing. I think it was probably a savvy move, and if health care reform ends up passing, then it was worth it.]

Second, the U.S. Supreme Court, in the second move in the space of a week to leave the America-watchers of the world chuckling, decided to reverse decades of precedent and assert that when it came to political speech, corporations, unions and other groups of individuals have more power than individuals.  Not only can corporations, unions and the like directly fund political campaigns, but unlike individuals, they are subject to no limit on their donations.  It’s great.  You’re going to end up seeing major political events sponsored by Pepsi.  You’re going to have unlimited funding available to opponents of any politician that does anything that runs contrary to a company that employs people in his or her district or state.  In short, you will never, ever again see anything serious passed in an election year in the United States unless it has not just bipartisan, but unanimous support.

So, no, as much as I like what Obama said, I don’t think it’ll ever become law.  It certainly won’t in 2010.

Clues they missed

Published on 18 January 2010 in Justice/Law, Security and USA. Tags: , , . 0 Comments

The NY Times has a nice piece summarising the clues that were not put together prior to the attempted Christmas Day attack on the Northwestern flight to Detroit.  All of those clues are presented in this graphic:

The article speaks of poorly designed computer systems, phrases mentioned in speeches (which, frankly, would be incredibly difficult to automatically include in your analysis) and general stories of the left hand not knowing what the right hand is doing within the US intelligence community.  To my mind, though, it really comes down to just a few simple points:

  • His own father had contacted the US to say that his son was missing and possibly being “radicalised,” leading to his being placed on a watch list.
  • He bought the ticket with cash.
  • He checked no luggage.

I firmly believe that most airport security is theatre, but the combination of just those three points should surely have warranted an individual pat-down.

More on the US bank tax

Published on 15 January 2010 in Finance and USA. Tags: , , , , . 0 Comments

Further to my last post, Greg Mankiw — who is not a man to lightly advocate an increase in taxes on anything, but who understands very well the problems of negative externalities and implicit guarantees — has written a good post on the matter:

One thing we have learned over the past couple years is that Washington is not going to let large financial institutions fail. The bailouts of the past will surely lead people to expect bailouts in the future. Bailouts are a specific type of subsidy–a contingent subsidy, but a subsidy nonetheless.

In the presence of a government subsidy, firms tend to over-expand beyond the point of economic efficiency. In particular, the expectation of a bailout when things go wrong will lead large financial institutions to grow too much and take on too much risk.
[...]
What to do? We could promise never to bail out financial institutions again. Yet nobody would ever believe us. And when the next financial crisis hits, our past promises would not deter us from doing what seemed expedient at the time.

Alternatively, we can offset the effects of the subsidy with a tax. If well written, the new tax law would counteract the effects of the implicit subsidies from expected future bailouts.

My desire for a convex (i.e. increasing marginal rate of) tax derives from the fact that the larger financial institutions are on the receiving end of larger implicit guarantees, even after taking their size into account.

Update:  Megan McArdle writes, entirely sensibly (emphasis mine):

That implicit guarantee is very valuable, and the taxpayer should get something in return. But more important is making sure that the federal government is prepared for the possibility that we may have to make good on those guarantees. If we’re going to levy a special tax on TBTF banks, let it be a stiff one, and let it fund a really sizeable insurance pool that can be tapped in emergencies. Like the FDIC, the existance of such a pool would make runs less likely in the shadow banking system, but it would also protect taxpayers. Otherwise, with our mounting entitlement liabilities, we run the risk of offering guarantees we can’t really make good on.

I agree with the idea, but — unlike Megan — I would allow some of it to be collected directly as a tax now on the basis that the initial drawing-down of the pool came before any of the levies were collected (frustration at the political diversion of TARP funds to pay for the Detroit bailout aside).

The US bank tax

Published on 14 January 2010 in Finance, Politics and USA. Tags: , , , . 0 Comments

Via Felix Salmon, I see the basic idea for the US bank tax has emerged:

The official declined to name the firms that would be subject to the tax aside from A.I.G. But the 50-odd firms, which include 10 to 15 American subsidiaries of foreign institutions, would include Goldman Sachs, JPMorgan Chase, General Electric’s GE Capital unit, HSBC, Deutsche Bank, Morgan Stanley, Citigroup and Bank of America.

The tax, which would be collected by the Internal Revenue Service, would amount to about $1.5 million for every $1 billion in bank assets subject to the fee.

According to the official, the taxable assets would exclude what is known as a bank’s tier one capital — its core finances, which include common and preferred stock, disclosed reserves and retained earnings. The tax also would not apply to a bank’s insured deposits from savers, for which banks already pay a fee to the Federal Deposit Insurance Corporation.

i.e. 0.15%.  It’s certainly simple and that counts for a lot.  It’s difficult to argue against something like this.

I would still have liked to see it as a convex function so that, for example, it might be 0.1% for the first 50 billion of qualifying assets, 0.2% for the next 50 billion and 0.3% thereafter.

Better yet, pick a size that represents too big to fail (yes, it would be somewhat arbitrary), then set it at 0% below, and increasing convexly above, that limit.

Nassim Taleb takes bat, ball; goes home

Published on 1 December 2009 in Economics, Epistemology and USA. Tags: , , , , . 2 Comments

The author of The Black Swan doesn’t approve of the looming reappointment of Ben Bernanke as chairman of the US Federal Reserve.  Writing in the Huffington Post, he says:

What I am seeing and hearing on the news — the reappointment of Bernanke — is too hard for me to bear. I cannot believe that we, in the 21st century, can accept living in such a society. I am not blaming Bernanke (he doesn’t even know he doesn’t understand how things work or that the tools he uses are not empirical); it is the Senators appointing him who are totally irresponsible — as if we promoted every doctor who caused malpractice. The world has never, never been as fragile. Economics make[sic] homeopath and alternative healers look empirical and scientific.

No news, no press, no Davos, no suit-and-tie fraudsters, no fools. I need to withdraw as immediately as possible into the Platonic quiet of my library, work on my next book, find solace in science and philosophy, and mull the next step. I will also structure trades with my Universa friends to bet on the next mistake by Bernanke, Summers, and Geithner. I will only (briefly) emerge from my hiatus when the publishers force me to do so upon the publication of the paperback edition of The Black Swan.

Bye,
Nassim

That’s quite a god complex Taleb’s got going on there (“he doesn’t even know he doesn’t understand how things work”).

Food stamps in America

Published on 30 November 2009 in Economics, Politics and USA. Tags: , , , , , , . 2 Comments

Here is a NY Times article doing what the NY Times does well, this time looking at the use of food stamps across America.  Here are the basic details (emphasis is all mine):

With food stamp use at record highs and climbing every month, a program once scorned as a failed welfare scheme now helps feed one in eight Americans and one in four children.

It has grown so rapidly in places so diverse that it is becoming nearly as ordinary as the groceries it buys. More than 36 million people use inconspicuous plastic cards for staples like milk, bread and cheese
[...]
the program is now expanding at a pace of about 20,000 people a day. There are 239 counties in the United States where at least a quarter of the population receives food stamps
[...]
Nationwide, food stamps reach about two-thirds of those eligible, with rates ranging from an estimated 50 percent in California to 98 percent in Missouri. Mr. Concannon urged lagging states to do more to enroll the needy, citing a recent government report that found a sharp rise in Americans with inconsistent access to adequate food.
[...]
Unemployment insurance, despite rapid growth, reaches about only half the jobless (and replaces about half their income), making food stamps the only aid many people can get — the safety net’s safety net.

Support for the food stamp program reached a nadir in the mid-1990s when critics, likening the benefit to cash welfare, won significant restrictions and sought even more. But after use plunged for several years, President Bill Clinton began promoting the program, in part as a way to help the working poor. President George W. Bush expanded that effort, a strategy Mr. Obama has embraced.

The revival was crowned last year with an upbeat change of name. What most people still call food stamps is technically the Supplemental Nutrition Assistance Program, or SNAP.
[...]
Now nearly 12 percent of Americans receive aid — 28 percent of blacks, 15 percent of Latinos and 8 percent of whites. Benefits average about $130 a month for each person in the household, but vary with shelter and child care costs.
[...]
Use among children is especially high. A third of the children in Louisiana, Missouri and Tennessee receive food aid. In the Bronx, the rate is 46 percent. In East Carroll Parish, La., three-quarters of the children receive food stamps.

A recent study by Mark R. Rank, a professor at Washington University in St. Louis, startled some policy makers in finding that half of Americans receive food stamps, at least briefly, by the time they turn 20. Among black children, the figure was 90 percent.

I’m not sure how I feel about food stamps.  The classically-trained economist in me wants to point out that money is fungible, so that:

  • for people that, if they were given the equivalent amount of cash, would have bought the same amount of food,  the program largely serves to impose unnecessary administrative costs over a simple cash transfer and places a stigma on the recipients; and
  • for people that, if they were given the equivalent amount of cash, would have bought less food, the program (arguably) willfully deprives them of welfare in addition to the administrative costs and stigma.

On the other hand, we have that:

  • for the (presumed) minority of recipients that have problems with drug or alcohol abuse or have a family member that has problems, receiving aid in the form of food stamps helps ensure that there’s still food on the table (although I do assume that there is a secondary market in food stamps, not to mention in food itself);
  • for the recipients living in high-crime areas, the incentive to steal food stamps is lower than that to steal cash (even if there is a secondary market, it’ll be annoying to deal with and won’t give 100 cents on the dollar), so receiving food stamps is safer;
  • by giving people food stamps instead of cash, you reduce the possibility of a sense of entitlement emerging (one of the major problems in countries, like Britain, with comprehensive welfare systems is that recipients can come to consider the aid they receive as their right and not just (hopefully temporary) assistance); and
  • America, for some reason that is mostly beyond me, has always had trouble facing up to the moral imperative to assist those in genuine need and presenting that assistance as food stamps seems to have granted it some political cover.

Anyway, the NY Times piece comes with some more fantastic graphics.  Here are two snapshots (click-through on either of them to get to the good stuff on the NY Times website):

NYTimes_Foodstamps

NYTimes_Foodstamps_Change

On interest rates

Published on 23 November 2009 in Economics, Finance and USA. Tags: , , , , , . 0 Comments

In what Tyler Cowen calls “Critically important stuff and two of the best recent economics blog posts, in some time,” Paul Krugman and Brad DeLong have got some interesting thoughts on US interest rates.  First Krugman:

On the face of it, there’s no reason to be worried about interest rates on US debt. Despite large deficits, the Federal government is able to borrow cheaply, at rates that are up from the early post-Lehman period … but well below the pre-crisis levels:

DESCRIPTION

Underlying these low rates is, in turn, the fact that overall borrowing by the nonfinancial sector hasn’t risen: the surge in government borrowing has in fact, less than offset a plunge in private borrowing.

So what’s the problem?

Well, what I hear is that officials don’t trust the demand for long-term government debt, because they see it as driven by a “carry trade”: financial players borrowing cheap money short-term, and using it to buy long-term bonds. They fear that the whole thing could evaporate if long-term rates start to rise, imposing capital losses on the people doing the carry trade; this could, they believe, drive rates way up, even though this possibility doesn’t seem to be priced in by the market.

What’s wrong with this picture?

First of all, what would things look like if the debt situation were perfectly OK? The answer, it seems to me, is that it would look just like what we’re seeing.

Bear in mind that the whole problem right now is that the private sector is hurting, it’s spooked, and it’s looking for safety. So it’s piling into “cash”, which really means short-term debt. (Treasury bill rates briefly went negative yesterday). Meanwhile, the public sector is sustaining demand with deficit spending, financed by long-term debt. So someone has to be bridging the gap between the short-term assets the public wants to hold and the long-term debt the government wants to issue; call it a carry trade if you like, but it’s a normal and necessary thing.

Now, you could and should be worried if this thing looked like a great bubble — if long-term rates looked unreasonably low given the fundamentals. But do they? Long rates fluctuated between 4.5 and 5 percent in the mid-2000s, when the economy was driven by an unsustainable housing boom. Now we face the prospect of a prolonged period of near-zero short-term rates — I don’t see any reason for the Fed funds rate to rise for at least a year, and probably two — which should mean substantially lower long rates even if you expect yields eventually to rise back to 2005 levels. And if we’re facing a Japanese-type lost decade, which seems all too possible, long rates are in fact still unreasonably high.

Still, what about the possibility of a squeeze, in which rising rates for whatever reason produce a vicious circle of collapsing balance sheets among the carry traders, higher rates, and so on? Well, we’ve seen enough of that sort of thing not to dismiss the possibility. But if it does happen, it’s a financial system problem — not a deficit problem. It would basically be saying not that the government is borrowing too much, but that the people conveying funds from savers, who want short-term assets, to the government, which borrows long, are undercapitalized.

And the remedy should be financial, not fiscal. Have the Fed buy more long-term debt; or let the government issue more short-term debt. Whatever you do, don’t undermine recovery by calling off jobs creation.

The point is that it’s crazy to let the rescue of the economy be held hostage to what is, if it’s an issue at all, a technical matter of maturity mismatch. And again, it’s not clear that it even is an issue. What the worriers seem to regard as a danger sign — that supposedly awful carry trade — is exactly what you would expect to see even if fiscal policy were on a perfectly sustainable trajectory.

Then DeLong:

I am not sure Paul is correct when he says that the possible underlying problem is merely “a technical matter of maturity mismatch.” The long Treasury market is thinner than many people think: it is not completely implausible to argue that it is giving us the wrong read on what market expectations really are because long Treasuries right now are held by (a) price-insensitive actors like the PBoC and (b) highly-leveraged risk lovers borrowing at close to zero and collecting coupons as they try to pick up nickles in front of the steamroller. And to the extent that the prices at which businesses can borrow are set by a market that keys off the Treasury market, an unwinding of this “carry trade”–if it really exists–could produce bizarre outcomes.

Bear in mind that this whole story requires that the demand curve slope the wrong way for a while–that if the prices for Treasury bonds fall carry traders lose their shirts and exit the market, and so a small fall in Treasury bond prices turns into a crash until someone else steps in to hold the stock…

For reference, here are the time paths of interest rates for a variety of term lengths and risk profiles (all taken from FRED):

interest_rates_1monthinterest_rates_3monthsinterest_rates_30years

To my own mind, I’m somewhat inclined to agree with Krugman.  While I do believe that the carry trade is occurring, I suspect that it’s effects are mostly elsewhere, or at least that the carry trade is not being played particularly heavily in long-dated US government debt relative to other asset markets.

Notice that the AAA and BAA 30-year corporate rates are basically back to pre-crisis levels and that the premium they pay over 30-year government debt is also back to typical levels.  If the long-dated rates are being pushed down to pre-crisis levels solely by increased supply thanks to the carry trade, then we would surely expect the quantity of credit to also be at pre-crisis levels.  But new credit issuance is down relative to the pre-crisis period.  Since the price is largely unchanged, that means that both demand and supply of credit have shrunk – the supply from fear in the financial market pushing money to the short end of the curve and the demand from the fact that there’s been a recession.