" Any attack on AIDS should therefore include an attack on poverty. "

http://www.nytimes.com/2007/01/10/business/10leonhardt.html?_r=1&oref=slogin

The Future of Economics Isn't So Dismal

By DAVID LEONHARDT
Chicago

On a summer day a few years ago, a recent college graduate named Emily Oster
was talking to her boyfriend about the research that was, and wasn't, being done
on the spread of AIDS. She was an aspiring economist at the time, getting ready
to go to graduate school, and she was struck by the fact that her field had little to
say about why some countries had such high H.I.V. rates.

To most people, that may not sound like a question an economist needs to be
asking. It's more the domain of epidemiologists or public health workers, and
they were already doing good work on it. But economists have been acting a lot
like intellectual imperialists in the last decade or so. They have been using their
tools - mainly the analysis of enormous piles of data to tease out cause and
effect - to examine everything from politics to French wine vintages. As the
daughter of two economists, Ms. Oster probably understood this better than
most 22-year-olds. Her father, Ray Fair, invented a semi-famous economic
formula that has an impressive track record of predicting presidential elections.
Her mother, Sharon Oster, studies business strategy.

So during her time as a Ph.D. student at Harvard, the younger Ms. Oster took
on AIDS in Africa. Her most provocative finding was that Africans didn't really
behave so differently from people in countries with much lower H.I.V. rates.
They did not have many more sexual partners than Americans on average. And,
like Americans, Africans had cut back on unsafe sex in response to AIDS - or
at least relatively well-off, healthy Africans had. Poorer Africans, who of course
make up the continent's overwhelming majority, had made fewer changes. They
had less of an incentive to practice safe sex, Ms. Oster concluded, because many
of them could not expect to reach old age, whether or not they contracted H.I.V.
Any attack on AIDS should therefore include an attack on poverty. "This is not
the kind of thing epidemiologists would do. It's not the way they would have
framed it," Ms. Oster, now 26, said. "It's an idea only an economist would love."

Whatever you think of her conclusions, there's no denying that her subject is
more interesting - and, yes, more important - than the esoteric fiscal and
monetary models that once dominated economics. Ms. Oster is studying death,
not taxes. Last weekend, hundreds of economists gathered in Chicago for their
annual conference, where they interviewed one another for job openings,
presented new research papers and had the occasional glass of wine. This
was my sixth such conference, and I have often been stunned by how much
of the research here, like Ms. Oster's work, would interest non-economists.
As "The Soulful Science," a new book by Diane Coyle, puts it, there has
been a "remarkable creative renaissance in how economics is addressing
the most fundamental questions - and how it is starting to help solve
problems." The reams of data that computers can now crunch have
ushered the field into a new golden age, Ms. Coyle writes, yet most
of its accomplishments are not widely known.

So before this year's conference, I did an informal poll of about 20 senior
economists around the country and asked a single question: who are the
young (untenured) economists doing work that is both highly respected among
experts and relevant to the rest of us? Who, in other words, is the future of
economics? Thirteen names came up more than once, and I'm sure a scientific
survey would have produced a longer list. As it is, though, the list is incredibly
diverse. It includes Justin Wolfers, who once worked for an Australian bookie
and is now an expert on online prediction markets , and Raj Chetty, who grew
up in both India and Milwaukee and studies antipoverty policy.

Ms. Oster is on the list, and so is the boyfriend with whom she first discussed
her AIDS ideas: Jesse Shapiro, now her husband. He has done innovative
work on, among other things, the benefits of television for some toddlers.
The two of them are the inaugural fellows at a University of Chicago
research center run by Gary Becker (a Nobel laureate), Steven Levitt
(co-author of "Freaknomoics") and Kevin Murphy (winner of a MacArthur
genius award). In fact, the least diverse aspect of the list of 13 - the full
roster appears above - may be the way that its members have chosen
their mates. Six of them are married to another person in the group. In
the end, this new era of economics matters because it has a chance to
influence the world that is its subject matter. Ms. Oster, for example,
has presented her work to the President's Commission on AIDS and
others, and her findings seem to be one small part of the recent push
for better H.I.V. prevention measures.

In Massachusetts, a 41-year-old economist named Jonathan Gruber helped
design the new state program to provide health insurance for every resident,
which is a model for the California plan announced on Monday. The new
federal pension law, meanwhile, encourages employers to sign up workers
automatically for 401(k) plans largely because academic research has shown
just how costly procrastination is.

For all this success, though, there are still two big obstacles holding back
the economics revolution. The first is that the field remains too narrow in
its approach. As David Colander, an economist at Middlebury College,
notes, researchers are rewarded - with job offers, endowed chairs and
prizes - for finding statistically significant patterns that can be published
in prestigious journals. They're generally not rewarded for collaborating
with experts in other fields to put those patterns into better context. As a
result, there is too much "cleverness for cleverness's sake," Mr. Colander
says, and not enough "judgment and wisdom."

The second obstacle is that when economists do uncover a nugget of true
wisdom, they're often hesitant to follow it to its natural conclusion and to
become principled advocates for better policy. Theirs is not to judge, they
insist, only to report what they find. Otherwise, they may risk their reputation
for impartial research. Which is a fair point. But it's a risk worth taking,
because the alternative is frankly much worse. When David Hume, the
philosopher and friend of Adam Smith, called for the establishment of a
"science of human nature" in the 18th century, he helped invent modern
economics. The new generation of researchers will probably come closer
to realizing his vision, and to making economics a true science, than any of
their predecessors. But think about what scientists do when they uncover a
problem: they try to solve it. To do otherwise is to let an impressive piece
of research turn into a scientifically rigorous piece of trivia.

E-mail: leonhardt@nytimes.com