I have commented before on the phenomenon where changing units turns an obviously approximate number into a weirdly precise one. Here is a new example, from the Guardian’s disturbing report on the mass slaughter of donkeys for the use of their hides in traditional Chinese medicine:
Since the booming skin trade has driven up donkey prices, owners struggle to replace their animals when they are stolen. The cost of a donkey in Kenya increased from £78 to £156 between 2016-19.
£78 seems like an oddly precise figure for what is surely a very diverse market in animals of varying qualities. Even weirder is that that precise figure precisely doubled in the period under consideration. Then it occurred to me, at current exchange rates £78 is about what you get when you convert the round number of US$100. So I’m going to hazard a guess that the reporter was told that the price had risen from around $100 to around $200, and simply converted it to pounds for the UK market without further comment.
Fully consistent with what the PM is saying now:
There came two other gentlemen, one of whom uttered the common-place complaints, that by the increase of taxes, labour would be dear, other nations would undersell us, and our commerce would be ruined.
JOHNSON (smiling). ‘Never fear, Sir. Our commerce is in a very good state; and suppose we had no commerce at all, we could live very well on the produce of our own country.’
This was Samuel Johnson, in the 1770s, who also wrote that
The interruption of trade, though it may distress part of the community, leaves the rest power to communicate relief; the decay of one manufacture may be compensated by the advancement of another…
Johnson, of course, also famously said that “patriotism is the last refuge of the scoundrel.” Which may somehow be relevant.
Several months ago I suggested that no one could ultimately support soft Brexit, because the soft Brexit strategy — something like EFTA, formally outside of the EU, but still in a customs union and/or the single market, still recognising most rights of EU citizens in the UK — is, to use a bit of economics game-theory jargon, Pareto dominated by staying in the EU. Even if the damage wrought by a no-deal Brexit would be vastly better worse by a negotiated surrender, if you look at it category by category — rights of UK citizens, disruption to markets, business flight, reputation, civil peace, diplomatic influence, sovereignty over market regulations — staying in the EU would be even better. There’s nothing you can point to and say, this is what we got for our trouble (which is why Theresa May was at such pains to bash immigrants when announcing her deal). We’ll always have Parisians.
Apparently, some other leading Brexiters are noticing their Pareto trap. Earlier in the week Dominic Raab resigned in protest that the deal (that he was responsible for negotiating himself!) was worse than staying in the EU. Today it’s Shanker Singham, leading trade adviser to the Leave campaign, who says “From a trade policy perspective this is a worse situation than being in the EU.” (Much of the Guardian article explains how this leading intellectual light of the Leave campaign has a mostly fake CV.)
The effect will be zero. The Brexit dead-enders only need to keep Parliament in turmoil and run out the clock, until their glorious Thelma & Louise consummation. I’m sure Jacob Rees-Mogg has shorted the pound, and the FTSE, so he’ll be fine. Would that count as insider trading?
George Monbiot has launched an exceptionally dyspeptic broadside in the Guardian against academic publishing, and in support of the heroic/misguided data scraper Alexandra Elbakyan, who downloaded millions of papers, and made them available on a pirate server.
I agree with the headline “Scientific publishing is a rip-off. We fund the research – it should be free”, but disagree with most of the reasoning. Or, maybe it would be better said, from my perspective as an academic his complaints seem to me not the most significant.
Monbiot’s perspective is that of a cancer patient who found himself blocked from reading the newest research on his condition. I think, though, he has underestimated the extent to which funding bodies in the UK and US, and now in the EU as well, have placed countervailing pressure for publicly funded research to be made available in various versions of “open access”, generally within six months of journal publication. In many fields — though not the biomedical research of most interest to Monbiot — it has long been the case that journal publication is an afterthought, with research papers published first as “preprints” on freely accessible archive sites. Continue reading “Anti-publishing”
Now that Theresa May has forced her cabinet to acknowledge a tiny portion of the reality of Brexit, Boris Johnson has apparently taken to moping around Whitehall to make certain that no one will think that he’s happy to now be conspiring with reality to betray his cause.
The best line is this:
Those close to the foreign secretary say that he feels he has been “bounced” into agreeing to a deal that is a world away from the hard Brexit he campaigned for. “He thinks that what’s on the table is so flawed we might even be better off staying in,” one said.
Continue reading “Boris Johnson has an attack of the sads”
In the classic prisoners’ dilemma, two members of a criminal gang have been caught by police. There is enough evidence to convict them of minor crimes, but without testimony from one of them they will receive only a light sentence, say one year in prison. If one of them agrees to cooperate with the investigation, prosecutors will let him out for time served, and be able to send the other to prison for ten years. But if they both cooperate with the investigation, both will go to prison for five years (perhaps because the prosecutors will have their information, but not their testimony). Key to the game is that the players are unable to coordinate their strategy. Clearly the best for both of them would be to keep quiet, but the strategy of cooperating with the investigation is superior, from their private perspective, regardless of what the other player does. So they both talk, and both get heavy sentences.
One weird thing about the story here is that the symmetry really doesn’t make sense. It’s not impossible, but it’s peculiar to imagine prosecutors being so interested in pinning the major crime on someone that they’re willing to let a confederate walk free, but indifferent to who flips on whom. That suggests we consider a less-known hierarchical version of this game, where one player is the powerful boss of a crime syndicate — let’s call him “The President” — and the other one is “The Attorney”, who knows all the details of his crimes, and is sufficiently involved to be criminally liable himself. Let’s call this game “The President’s Dilemma”. Continue reading “The president’s dilemma”
There’s no knowledge like secret knowledge… Prominent in today’s news is Labour’s contention that
leaked Home Office documents suggesting government cuts are linked to the rise in violent crime, and demanded the home secretary explain herself to parliament.
It’s a bizarre accusation, not because it is implausible, but because it could not be otherwise, and the suggestion that this has been “revealed” by a secret report is part of implicitly accepting an inane pattern of government — and not just government — obfuscation that I am choosing to call the magical zero marginal. The way it works is, the government (let us say) feels an urge to reduce expenditures on (let us say) policing. It’s a problem, because the voters rather like police, by and large, and feel that they derive benefit. Not to worry, says the government press release (possibly produced by a dedicated key on the Whitehall keyboard), there will be no reduction in service. The costs will be made up with efficiency gains. The claim is that there is a significant portion of the current budget that is bringing zero marginal benefit, and whose elimination will therefore cause no harm. Perhaps this portion doesn’t exist as a budget line item now, but will after a “reorganisation” — but then the implicit claim is that the costs of the reorganisation as well will be covered by the savings. Continue reading “The magical zero marginal”
When did the Conservatives become the party of immediate gratification? This follows a development across the Atlantic that I first noticed thirty years ago when Democratic presidential candidate Michael Dukakis was described as the “eat your peas” candidate.
I was shocked to hear from my daughter that her high school class had been given a talk encouraging them to consider leaving school and switching to an apprenticeship programme, because they could immediately be earning £3 an hour, or whatever it was. I thought this was just some weird individual thing, but then I saw an official government advertisement on a bus shelter making exactly this argument. I’m all in favour of apprenticeship programmes, but I think the choice of who should continue on to further education should not be best on the goal of getting paid £3 an hour right now. It is so obviously targeted at getting underprivileged children into menial jobs, to prevent them from rising above their station, that it astonishes me that the government was not too embarrassed to create this campaign.
Similar thinking seems to underly the recent proposal by the education secretary to reduce university fees for courses of study that tend to lead to lower salaries, which has been taken to be suggesting lower fees for arts and social science degrees, while maintaining current fees for science and technology degrees. This is a proposal to incentivise poorer students to prioritise short-term costs over long-term benefits. The most charitable interpretation one can have is that they read chapter 1 of the economics textbook, about prices being set by an equilibrium of supply and demand, and never made it to chapter 2, on the effect of incentives.
It’s purely coincidental that this would tend to brighten the career prospects of dimmer children of affluent familes. It’s almost like the Tories read about Mischel’s marshmallow test, and their response was that it’s unfair that poor children can get ahead just because they might happen to be constitutionally better inclined to delay gratification. I remember John Kerry being mocked in 2004 for having limited his children’s television viewing when they were young, showing them as out of touch with the habits of ordinary Americans, and thinking, self-indulgent habits work out different for aristocrats like the Bushes than for children of middle-class and working-class families. Which is perhaps exactly the point.
Economist David Blanchflower wrote an article for The Guardian inviting us to pity the poor underpaid university vice chancellors with their paltry sub-million-pound salaries. In discussing what an awful job it is, and why you
A vice-chancellor’s schedule is set for them. The job has a huge effect on family life. There are few places to hide and find privacy. You are always on show, even on the golf course.
Even on the golf course! Have these vice-chancellor-oglers no shame?
Oddly enough, the analysis by this economist, which included the striking phrase “If you pay peanuts, you get monkeys” — the monkey here being everyone who is not a vice chancellor — omitted any evidence that universities do indeed prosper from having non-monkeys doing the job. I mean, there are all kinds of jobs that are hard and important, but there’s a limit to how much you’re willing to pay to get just a tiny bit of extra talent (assuming that you can even reliable recognise those distinctions in the course of the hiring process). The suggestion is that you need to pay huge sums just to get one of the exceptional rare individuals who is even minimally qualified not to run the university into the ground. “In the end, there are few qualified and willing applicants.” I’d like to see some working-out on that problem.
Andrew Dilnot, former head of the UK Statistics Authority and current warden (no really!) of Nuffield College, gave a talk here last week, at our annual event honouring Florence Nightingale qua statistician. The ostensible title was “Numbers and Public policy: Why statistics really matter”, but the title should have been “Why people hate statisticians”. This was one of the most extreme versions I’ve ever seen of a speaker shopping trite (mostly right-wing) political talking points by dressing them up in statistics to make the dubious assertions seem irrefutable, and to make the trivially obvious look ingenious.
I don’t have the slides from the talk, but video of a similar talk is available here. He spent quite a bit of his talk trying to debunk the Occupy Movement’s slogan that inequality has been increasing. The 90:10 ratio bounced along near 3 for a while, then rose to 4 during the 1980s (the Thatcher years… who knew?!), and hasn’t moved much since. Case closed. Oh, but wait, what about other measures of inequality, you may ask. And since you might ask, he had to set up some straw men to knock down. He showed the same pattern for five other measures of inequality. Case really closed.
Except that these five were all measuring the same thing, more or less. The argument people like Piketty have been making is not that the 90th percentile has been doing so much better than the 10th percentile, but that increases in wealth have been concentrated in ever smaller fractions of the population. None of the measures he looked was designed capture that process. The Gini coefficient, which looks like it measures the whole distribution, because it is a population average is actually extremely insensitive to extreme concentration at the high end. Suppose the top 1% has 20% of the income. Changes of distribution within the top 1% cannot shift the Gini coefficient by more than about 3% of its current value. He also showed the 95:5 ratio, and low-and-behold, that kept rising through the 90s, then stopped. All consistent with the main critique of rising income inequality.
Since he’s obviously not stupid, and obviously understands economics much better than I do, it’s hard to avoid thinking that this was all smoke and mirrors, intended to lull people to sleep about rising inequality, under the cover of technocratic expertise. It’s a well-known trick: Ignore the strongest criticism of your point of view, and give lots of details about weak arguments. Mathematical details are best. “Just do the math” is a nice slogan. Sometimes simple (or complex) calculations can really shed light on a problem that looks to be inextricably bound up with political interests and ideologies. But sometimes not. And sometimes you just have to accept that a political economic argument needs to be melded with statistical reasoning, and you have to be open about the entirety of the argument. Continue reading “Why people hate statisticians”