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Yikes, not only is it hard for us to do experiments with firms, it can be really hard for firms to experiment on themselves

David McKenzie's picture
I came across a new working paper written by researchers at Google and Microsoft with the title “on the near impossibility of measuring the returns to advertising”. They begin by noting the astounding statistic that annual US advertising revenue is $173 billion, or about $500 per American per year. That’s right, more than the GDP per capita of countries like Burundi, Madagascar and Eritrea is spent just on advertising!

Introducing 'Ask Guido'

Berk Ozler's picture
This week we're introducing our new series that we decided to call 'Ask Guido.' Guido Imbens has kindly agreed to answer technical questions every so often and we are thrilled. For this first installment, Guido starts by answering a question about standard errors and the appropriate level of clustering in matching.

One question that often comes up in empirical work concerns the appropriate way to calculate standard errors, and in particular the correct level of clustering. Here is a specific version of the question that someone posed, slightly paraphrased:

The Hawthorne Effect: What Do We Really Learn from Watching Teachers (and Others)?

David Evans's picture
We are delighted that Dave Evans has agreed to be a semi-regular contributor to this blog, agreeing to post about once a month. David is a Senior Economist in the Chief Economist's Office for the Africa region of the World Bank, and coordinates impact evaluation work across sectors in the Africa region.

Weekly Links February 14: Valentines, Generalizability, Distinguishing a Prominent Development Economist from Your Drunk Uncle, and More…

David McKenzie's picture

Becoming a Man (and Good at Math)

Berk Ozler's picture
Although, I try to follow the research in my field regardless of where it is conducted, I usually don’t pick studies from the U.S. or other developed countries for discussion in this space. However, when the study involves interventions to improve various outcomes for adolescents, reports some encouraging findings, and may be applicable in the developing world, we can make an exception. So, today’s post is about a study that takes place in a public high school on the south side of Chicago…