Archive for June, 2008

Evolutionary stability of homosexuality

Thursday, June 26th, 2008

I have long been dissatisfied with the attempts I’ve seen to explain why evolution hasn’t made homosexuality rare.
A new paper in PLoS ONE: Sexually Antagonistic Selection in Human Male Homosexuality presents a model that seems adequate.
The main idea (from this summary) is that

a heightened sexual response to men could make women more likely to pass on their genes, while making men possessing the trait less likely to do so.

The paper notes this evidence to support it:

homosexuals’ mothers are more fecund than mothers of heterosexuals. Further female fecundity asymmetries include a higher fecundity of maternal vs. paternal aunts of homosexuals

This model provides hints about why homosexuality is not rare among other species.
My main reservation is that the model leads me to expect bisexuality to be somewhat more likely than homosexuality.

Cultural Difference

Thursday, June 19th, 2008

Cultural Difference
From a book called Apples are from Kazakhstan, a conversation in which the author reacts to a trendy Almaty restaurant’s nostalgic depiction of Lenin and Stalin:

“It’s inconceivable to think of a Nazi beer cellar in Berlin hung with swastikas, with the waiters dressed up as SS officers handing out postcards of Goebbels, and a bust of ‘Uncle Adolf’ in the corner.”
“They don’t have a place like that?” my friend asked

Bad Samaritans

Friday, June 13th, 2008

Book review: Bad Samaritans: The Myth of Free Trade and the Secret History of Capitalism by Ha-Joon Chang.
This book attacks orthodoxies of the World Bank, IMF, WTO, neo-liberal economists, free-market economists, and pundits such as Thomas Friedman. Chang often implies that they all share a common orthodoxy, but the ideas he attacks are usually questioned by some of those groups.
His criticisms of the World Bank, IMF, and WTO are often correct, but it shouldn’t be surprising that they serve goals that don’t coincide with needs of developing countries.
His most important argument is a defense of mercantilist protection of infant industries. He shows that the evidence on the effects of tariffs is sufficiently mixed that his selective use of examples can give the impression that he has shown tariffs promote economic growth in developing countries. He makes claims of the form “X would have failed without protection”, but doesn’t say why his ability to predict failure is more reliable than other alleged experts (e.g. MITI’s belief that Honda would fail in the auto business). This provoked me into searching for more complete tests of the effects of tariffs. The evidence I found confirms that his confidence that tariffs work is foolish, but I was surprised to find that the evidence is too unclear to provide a guide to policy decision.
Chang has a good argument that the common orthodoxy about comparative advantage is a less conclusive reason for removing tariffs than it appears. But his attempts to describe a mechanism by which tariffs can be beneficial are naive. He talks about government protecting infant industries the way a parent protects a child, without any analysis of the political forces which cause governments to protect entrenched declining industries at the expense of less politically powerful startups.
He gives only vague hints about how to distinguish the tariffs he thinks are good from bad tariffs. I’ll offer a suggestion: any tariff that is designed to meet his notion of a good tariff should be set by statute to decrease to zero over a period of about a decade and never be reinstated for an industry to which they’ve been applied under this statute.
His complaints about privatizing state-owned enterprises contain some valid points. I wish people didn’t assume government and stockholder control are the only available choices. Having governments spin off enterprises as nonprofits would sometimes (often?) be a better option.
His comments about how patents and copyright affect developing countries are mostly correct. But he underestimates our dependence on drug patents when he implies that the 57% of drug research funding that comes from not-for-profit sources means we could get 57% of the results without commercial funding. A drug startup that will go broke if it doesn’t produce something valuable does different work than someone whose success comes from publishing papers.
Chang’s modest suggestions for patent reform would provide much less improvement than ideas I’ve found by reading free-market economists (e.g. prizes instead of patents, or Kremer’s patent buyout proposal).
His comments about inflation assume that it produces some benefits, but he shows no awareness of the economic literature which disputes that assumption.
He has plausible hypotheses that increasing market forces might cause an increase in corruption in some countries. I see no easy way to estimate the size of these effects.
His arguments that cultures change in response to economic change more than most people realize are strong enough to lower my opinion of Fukuyama’s book Trust (Fukuyama seems unaware that the German current high-trust culture is very different from a century ago when they had a reputation for dishonesty). But Chang exaggerates a lot when he says immigrants from poor countries working much harder in rich countries proves that work habits result from economic conditions rather than culture – those immigrants are unlikely to be typical of the culture they came from.

Counting Sheep

Wednesday, June 4th, 2008

Book review: Counting Sheep: The Science and Pleasures of Sleep and Dreams by Paul Martin.
This book makes convincing claims that most people give too little thought to an activity that occupies a large fraction of our life.
It has lots of little pieces of information which can be read as independent essays. Here are some claims I found interesting:

  • “sleepiness is responsible for far more deaths on the roads than alcohol or drugs”.
  • Tired people rate their abilities higher than people who slept well do.
  • Poor sleep contributes to poor health a good deal more than medical diagnoses suggest, but hospitals are designed in ways that hinder patients’ sleep.
  • Idle time was apparently a status symbol up to a century ago, now being busy is a status symbol. This should have economic implications that someone ought to explore in depth.
  • People in a vegetative state have REM sleep. This sounds like cause to re-evaluate the label we apply to that state.

While the book has many references, it doesn’t connect specific claims to references, and I’m sometimes left wondering why I should believe a claim. How can boredom be a modern concept? When he says “no person has ever gone completely without sleep for more than a few days”, how does he know he can dismiss people who claim to have not slept for years?