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The 10,000 Year Explosion

Posted by Peter on March 15, 2009
Posted in: Book Reviews, The Human Mind. Tagged: , , .

Book review: The 10,000 Year Explosion: How Civilization Accelerated Human Evolution by Gregory Cochran and Henry Harpending.

This provocative book describes many recent genetic changes in humans, primarily those resulting from the switch from hunter-gatherer lifestyles to agricultural lifestyles. Large changes in diets and disease are the simplest causes of change, but the book also describes subtler influences that alter human minds as well.

I had believed that large populations rarely evolve very fast due to the time required for a mutation to spread. This is true for mutations which provide negligible selective advantage, but the book shows that it’s plausible that a number of mutations have recently gained a large enough selective advantage that the rate at which they become widespread is only modestly dependent on population size. Also, the book makes a surprising but plausible claim that the larger supply of mutations in large populations can mean large populations evolve faster than small populations.

The book is occasionally not as rigorous as I would like. For instance, the claim that Ashkenazi “must have been exposed to very similar diseases” as their neighbors is false if the diseases were sexually transmitted.

Most of their claims convince me that conventional wisdom underestimates how important human genetic differences compared to cultural differences, but leave plenty of room for doubt about the magnitude of that underestimation.

They provide an interesting counterargument to the claim that differences within human populations are larger than the differences between populations. Their belief that differences between populations are more important seems to rest on little more than gut feelings, but they convince me that the conventional wisdom they’re disputing is poorly thought out.

They convinced me to take more seriously the possibility that some Neanderthal genes have had significant effects on human genes, although I still put the odds on that at less than 50 percent.

Human Accomplishment

Posted by Peter on August 12, 2008
Posted in: Book Reviews, Life, the Universe, and Everything, Science and Technology. Tagged: , .

Book review: Human Accomplishment: The Pursuit of Excellence in the Arts and Sciences, 800 B.C. to 1950 by Charles Murray.
I was reluctant to read this book but read it because a reading group I belong to selected it. I agree with most of what it says, but was underwhelmed by what it accomplished.
He has compiled an impressive catalog of people who have accomplished excellent feats in arts, science, and technology.
He has a long section arguing that the disproportionate number of dead white males in his list is not a result of bias. Most of this just repeats what has been said many times before. He appears do have done more than most to check authorities of other cultures to verify that their perspective doesn’t conflict with his. But that’s hard to do well (how many different languages does he read well enough to avoid whatever selection biases influence what’s available in English?) and hard for me to verify. He doesn’t ask how his choice of categories (astronomy, medicine, etc) bias his results (I suspect not much).
His most surprising claim is that the rate of accomplishment is declining. He convinced me that he is measuring something that is in fact declining, but didn’t convince me that what he measured is important. I can think of many other ways of trying to measure accomplishment: number of lives saved, number of people whose accomplishment was bought by a million people, number of people whose accomplishment created $100 million in revenues, the Flynn Effect, number of patents, number of peer-reviewed papers, or number of meta–innovations. All of these measures have nontrivial drawbacks, but they illustrate why I find his measure (acclaim by scholars) very incomplete. An incomplete measure may be adequate for conclusions that aren’t very sensitive to the choice of measure (such as the male/female ratio of important people), but when most measures fail to support his conclusion that the rate of accomplishment is declining, his failure to try for a more inclusive measure is disappointing.
His research appears careful to a casual reader, but I found one claim that was definitely not well researched. He thinks that “the practice of medicine became an unambiguous net plus for the patient” around the 1920s or 1930s. He cites no sources for this claim, and if he had found the best studies on the subject he’d see lots of uncertainty about whether it has yet become a net plus.

The Birth of Plenty

Posted by Peter on April 8, 2008
Posted in: Book Reviews, Economics. Tagged: , .

Book review: The Birth of Plenty : How the Prosperity of the Modern World was Created by William Bernstein.
This book contains many ideas about the causes of economic growth that are approximately right, but rarely backs them up with good arguments.
He starts by saying four institutions are needed to escape from a Malthusian trap: property rights (rule of law), reason (scientific methods), capital markets, and fast transportation/communication. But later when discussing why some countries were slow to develop, he adds ad hoc explanations (e.g. “excessive military expenditure” “reliably derails great nations”).
The biggest shortcoming of the book is that it ignores evidence that China provides a counter-example to his main claims. He doesn’t acknowledge expert claims that parts of China around 1800 had a degree of property rights and rule of law that was comparable to England at that time, nor does he discuss the recent dramatic Chinese takeoff that happened with a mediocre degree of property rights and rule of law.
He gives many hints about why those four institutions are helpful, but provides little evidence that any one is essential. About the closest he comes to providing rigorous evidence is a graph indicating how much of economic growth appears to be explained by a Rule-of-Law indicator. He follows that with a similar graph of how government spending levels explain economic growth, and claims the negative effect of government spending would be invisible without the computed trend line, but the rule-of-law trend is more impressive. I see those graphs differently. The most obvious trend is that government spending over about 15 to 18% (of GDP?) reduces growth, with no obvious pattern for lower spending levels. The most obvious trend in the rule-of-law graph is that low values on the rule-of-law indicator are associated with larger variations in economic growth, which is somewhat contrary to his claim that such values reliably prevent growth.
The section I found most valuable was the one describing reasons for thinking that 16th century Holland created the beginnings of the industrial revolution.
There are enough misleading or false statements in the book to convince me not to trust him. For example, he refers to eclipse prediction around 1700 as a spectacular change to what was previously a mystery. He appears unaware that eclipses had been predicted more than a millennium earlier.
He often digresses into anecdotes that have no apparent relevance. For example, he claims “a healthy market for government debt is, in fact, essential for funding business”. After giving two implausible theoretical reasons for that claim, he says it was “vividly demonstrated in the U.S.” in 1862, but then gives a description of how government bonds were sold, without mentioning anything about the effect on business.
His discussion of the possible trade-offs between inflation and unemployment makes a claim that increased unemployment caused more unhappiness than “an identical rise in inflation”. But inflation is measured in different units that unemployment. If we happened to measure inflation in percent per presidential election, the naive comparison would work much differently. (He is subtly misinterpreting a serious paper that is hard to fully explain to laymen).
His advice to undeveloped nations includes “before a nation builds roads … it must first train lawyers”, which makes me doubt his understanding of what causes the rule of law.

Causes of African Poverty

Posted by Peter on September 19, 2007
Posted in: Economics, Politics. Tagged: , .

I’ve occasionally heard claims about Africa being poor because it was exploited by Europeans and Americans, and I’ve dismissed those claims because they were clearly based on superstitions.
Recently I’ve come across some scholarly writings on the effects of interactions between these cultures.
A paper on Colonial legacies and economic growth confirms my suspicions that areas which were colonized for longer times have higher economic growth.
As I mentioned recently, the book The Bottom Billion shows a connection between poverty and sale of natural resources, but explains several mechanisms by which the revenues could make bad governments more likely, independent of whether the buyers of those resources exploit the sellers. This suggests it’s not easy to resolve claims that such exploitation caused harm.
The most interesting study is The Long-Term Effects of Africa’s Slave Trade (via Freakonomics and Andrew Sullivan), which demonstrates that slave trade between Africa and other continents between 1400 and 1900 is significantly correlated with poverty now. The paper presents a good argument that the causal connection was mainly increased violent conflict due to rewards for enslaving people from neighboring villages (as opposed to prior forms of slavery which resulted from conquest by ethnic groups from somewhat farther regions). This caused social and ethnic fragmentation and corruption. I have doubts about whether the details of the paper’s causal model are correct, but they appear to be approximately correct.

Black Rednecks

Posted by Peter on July 14, 2007
Posted in: Book Reviews, U.S. Politics. Tagged: , , .

Book review: Black Rednecks And White Liberals by Thomas Sowell.
Thomas Sowell is a pretty smart guy. It’s unfortunate that he wastes his skills on reinforcing peoples’ existing political opinions. Much of what he says in this book is right, but the new ideas it offers don’t seem like they ought to change the political opinions of anyone who has thought much about racial politics. And the old but wise arguments are written in a style that seems designed to turn off anyone who isn’t already a fan of Sowell’s ideas.
He presents interesting evidence that the culture of black ghettos came from parts of Britain that were uncivilized at the time its bearers moved to the southern U.S. This is the kind of subject where it’s virtually impossible for most readers to tell whether he’s being objective or selecting evidence to fit his biases. More importantly, it’s hard to tell why it matters. Some people pay lip service to the authenticity of black culture, but I find it hard to believe that the origins of the culture several centuries ago plays an important role in peoples’ choice to adopt the culture.
One interesting aspect of Sowell’s story is that the large migration from the rural south to the urban north after WWII did not result in the usual assimilation of the migrants into the culture of the area they moved to. How much of that was due to the number of migrants, to their culture, or to their race? Sowell ignores this subject.
Sowell’s argument that western civilization was responsible for the nearly worldwide abolition of slavery seems mostly right, but I’m disturbed by his exaggerations. He misleads readers into thinking that the first abolitionists were western, but a quick web search told me that Cyrus the Great wanted to abolish slavery worldwide two millennia earlier.
There are several places in the book where he makes confident, unsupported assertions as if they were certain, when I doubt anyone has enough evidence to make anything better than a rough guess. For instance, he thinks George Washington couldn’t have gotten a prohibition on slavery into the constitution without driving the south out of the union (plausible, but it depends on hard-to-verify assumptions about his powers of persuasion), and that slavery would have lasted longer without the union (a controversial enough claim that abolitionists such as William Lloyd Garrison seemed to reject it, claiming the north would be a better haven for runaway slaves if it seceded and repealed the Fugitive Slave Law). There are probably some leftists who unfairly attack Washington for failing to accomplish more than he could possibly accomplish, but I don’t see signs that they get respect from anyone who would listen to Sowell.
I’m quite suspicious of Sowell’s claim that Hitler’s pretenses of having been provoked into military action were intended only to fool people in Germany. Even if people in other countries had enough information to know Hitler was lying, it’s easy to imagine that a fair number of them were looking for a way to rationalize neutrality, and that Hitler was helping them to fool themselves.

Electing to Fight

Posted by Peter on November 10, 2006
Posted in: Book Reviews, Politics. Tagged: , .

Book review: Electing to Fight: Why Emerging Democracies Go to War by Edward D. Mansfield
This book makes a convincing argument that it’s misleading to assume that democracies are less likely to wage wars. That assumption is true of mature democracies, but unstable nations that are trying to make a transition to democracy are more likely than autocracies to wage war. At least part of the reasons are increased nationalism, competition among politicians to be the most nationalist, and the weakness of stabilizing institutions.
The book offers some hints about how a transition to a democracy might be managed to minimize the risks, but this part of the book is more speculative and less convincing.
In spite of the book’s relevance to current events, it devotes little attention to the present. It covers the time period from the French revolution to the present with the perspective of a historian, and says as much about Iraq in 1948 as it does about the recent experiment with democracy in Iraq. It is somewhat valuable for reminding us how many attempts at democracy failed and have largely faded from collective memories.
The dry, scholarly style of the book is a bit mind-numbing.

Underground Education

Posted by Peter on December 27, 2005
Posted in: Book Reviews. Tagged: .

Book Review: An Underground Education : The Unauthorized and Outrageous Supplement to Everything You Thought You Knew About Art, Sex, Business, Crime, Science, Medicine, and Other Fields of Human Knowledge by Richard Zacks
This book is an irreverent collection of interesting but mostly unimportant historical anecdotes.
A sampling of stories that I enjoyed:
The fork (at least as used for eating) was initially condemned as “the devil’s pitchfork” by priests who thought people ought to eat with their hands.
Witchcraft prosecutions were motivated at least in part by the desire of churches and civil authorities to get the property of the accused, until a legal change in 1630 prevented them from getting such property. Similar motivations for the inquisition, where property could be confiscated decades after the death of an alleged heretic how had owned it.
He describes mail order porn in 1863.
He has a photo of George Washington’s dentures, made from human teeth (presumably taken from dead soldiers).
The medieval church forbade doctors from dissecting human corpses to learn about anatomy and forbade surgery. Some of the other medical anecdotes suggest that there have been many times when patients would have been better off if the prohibition on surgery had lasted longer.
Don’t expect too much wisdom from these stories. One isolated place where he attempts a non-shallow analysis is when he asks “How did child labor start in America, and why was it widely tolerated”? Unfortunately, his attempts to analyze this merely consist of finding reports of child labor earlier than he thinks his readers expect. It doesn’t occur to him to ask whether people could even afford to do without child labor before the industrial revolution.

Betting on Sex

Posted by Peter on December 18, 2005
Posted in: Humor, Idea Futures. Tagged: , .

I’ve been slowly working my way through a book by Richard Zacks called An Underground Education. I’ve found one section that deserves a blog entry of it’s own (I’ll discuss the rest of the book when I’ve finished reading it).
It describes a fairly popular betting-style market that ran from 1771 to 1776 in London about whether a diplomat named Chevalier D’Eon was male or female. D’Eon apparently acted and dressed at times as a man, and at other times as a woman, and refused to help the bettors settle their bets (even when D’Eon was offered a large amount of money to provide evidence of his/her sex). Eventually bettors got tired of waiting for an outcome and resorted to at least one lawsuit. The judge decided that D’Eon was a woman based on testimony from both sides of the lawsuit. Why did the side who had bet D’Eon was a man produce testimony that D’Eon was a woman? It was part of an accusation that the other side traded on what the SEC would call inside information. After D’Eon’s death, mortuary attendants said D’Eon was a man.
Aside from the obvious implications for how idea future style markets need to word claims so as to assure a practical means of observing whether a claim is true or not within a practical time period, this report also says some odd things about gender stereotyping. Lots of people probably think prior generations mostly had Victorian attitudes toward gender confusion, but it seems that D’Eon was sufficiently respectable in 1792 to have a dinner party thrown to honor both Thomas Paine and D’Eon.

The Great Divergence

Posted by Peter on November 23, 2005
Posted in: Book Reviews, Economics. Tagged: , .

Book Review: The Great Divergence: China, Europe, and the Making of the Modern World Economy, by Kenneth Pomeranz
This book does a good job of criticizing many Anglo-centric explanations of why Europeans industrialized first by providing detailed evidence that the area near the Yangzi river delta was mostly as advanced as England when England started the industrial revolution.
It does a less convincing job of arguing that coal and new world land were the main reasons for England’s success. I’m tempted to believe that American sugar provided desperately needed calories to break out of a Malthusian trap, but the evidence doesn’t show that became significant until the industrial revolution had already started.
Conveniently located coal undoubtedly gave England a boost, but not a big enough boost that there is a practical way to decide it was more important than the numerous cultural differences which might have given England the edge it needed.
The book makes a serious effort to dismiss those cultural explanations, but is not thorough enough. In particular, I’m disappointed with the cryptic way that it dismisses the relevance of the ideas in Helmut Schoeck’s book Envy.
The style is often deadening, with lengthy descriptions of details whose relevance is unobvious.