David Hagmann

@davidhagmann

Fellow. Behavioral Economics & Policy. My research looks at what kind of information people seek out (or avoid) & how they update their beliefs.

Boston, MA
dhagmann.com
Joined November 2009
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  1. Pinned Tweet
    Apr 8

    🍾New paper on "Measuring Information Preferences" with George Loewenstein & now out in Management Science.🎉We develop & validate a psychological scale and learn something about information, risk & time preferences along the way. 1/6

    3 replies 23 retweets 114 likes
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  2. Retweeted
    Jul 15

    You spent hundreds of hours thinking, running experiments (or "studies"), writing your paper, and navigating the review process. Spend at least an hour picking the title that will forever communicate your work to the world. 6/6

    3 replies 5 retweets 52 likes
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  3. Retweeted
    Aug 14

    As a result (again, please see the disclaimers in tweet #1), we are seeing a whole lot of stories of people from lower-income families whose A*AA mocks and A*A*A predictions are coming out at ABD, and who are missing out on either their first choice or any university place. /15

    3 replies 12 retweets 93 likes
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  4. 19 hours ago

    This appears to be the basis for accepting students to university in the UK this year. We can argue the merits of standardized exams, but imputing the grade of a standardized exam based on the performance of past students in your school is just horrendous

    But here's the problem. When the model encounters two students, both of whom scored A*AA in their mock exams and are predicted to get A*A*A by their teachers, the *only* basis for distinguishing between them is the other factors. /12
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  5. Retweeted
    Aug 14

    Just watched a virtual summer camp performance from my kids that was supposed to end at noon. At 12:01, after we applauded, the lead counselor said "Time integrity!" and ended the meeting. I now plan to shout "Time integrity!" at any meeting that runs more than one minute late.

    7 replies 24 retweets 256 likes
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  6. Aug 12

    "To be African American you actually need dual citizenship in both countries"

    2 replies
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  7. Retweeted
    Aug 12

    Nice work. And it is time to start ensuring that all pre-registrations are thoroughly peer reviewed. If a pre-registration is vague/incomplete/not-adhered-to, the author should not be able to claim that the study was pre-registered.

    "The Curious Case of the Convenient Outliers: A Twitter Thread" A recent paper in a leading psych. journal reports a pre-registered experiment with significant results: The "Predicted High" condition is significantly different from the two "Predicted Low" conditions.
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    4 replies 5 retweets 23 likes
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  8. Retweeted
    Aug 11

    A data conference organizer just sent my husband 3 bottles of wine to invite him to their virtual conference (!). My husband: "Oh, do they not do this in academia?" So if you're looking for me today, I'll be drinking one of the bottles and questioning my life choices

    6 replies 2 retweets 147 likes
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  9. Retweeted
    Aug 11

    Really clever study. Viewed droplet spread with 15 types of mask. Suggests bandanas don’t work, gators enhance spread of droplets, but most other masks very helpful. Which masks best stop the spread of COVID-19? Duke researchers tested them to find out

    2 retweets 4 likes
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  10. Retweeted
    Aug 9

    This is fantastic: uses sound in addition to Bluetooth to detect proximity and doesn't give false alarms through walls. Just installed it and appears to run smoothly!

    I found a way to stay away from COVID-19! The NOVID app anonymously warns as COVID-19 approaches, so you can take care before it’s too late. It doesn’t even need everyone to join to work. I didn’t have to give it any personal information. Just go to .
    1 reply 2 retweets 1 like
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  11. Aug 10

    I bet surgical masks are more comfortable too. It's almost like they were designed for this very specific purpose!

    Really interesting mask comparison from Science, focusing on droplets, not aerosol. Low cost measurement. Bandanas and neck gators are not good.
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  12. Retweeted
    Aug 10

    This keeps popping up, and I'll retweet it every time.

    This 1944 CIA memo, on how to infiltrate an organisation and make it dysfunctional, is amazing. Worth framing in the coffee room of every company. ht
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    1 reply 2 retweets 17 likes
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  13. Aug 10

    Wonder how many papers on nudges to reduce borrowing track long term effects. This suggests they might do more harm than good

    🚨New Working paper🚨 with and Lesley Turner What happens when students have access to more student loans? They borrow more, complete more degrees, earn more later in life, and repay their loans more
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  14. Aug 9

    E.g. early rhetoric against masks almost surely did lasting damage. Would have been much easier to deal with supply shortages than trying to convince people we couldn't have known masks protect against droplet-based infections. Countries in Asia handled this much better

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  15. Aug 9

    The problem with the "trust the experts" narrative is that it assumes away conflicts of interest. Moreover, public health communication is often strategic, which could reasonably be perceived as misleading

    Five months into the pandemic, Chicago has bowling alleys open and beaches closed. And you wonder why people don’t trust the public health messaging.
    1 reply 1 retweet
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  16. Aug 9

    This is fantastic: uses sound in addition to Bluetooth to detect proximity and doesn't give false alarms through walls. Just installed it and appears to run smoothly!

    I found a way to stay away from COVID-19! The NOVID app anonymously warns as COVID-19 approaches, so you can take care before it’s too late. It doesn’t even need everyone to join to work. I didn’t have to give it any personal information. Just go to .
    1 reply 2 retweets 1 like
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  17. Aug 8

    Not just obnoxious, but impersonating a federal agent, even by pretending to be part of an agency that doesn't actually exist, is also a federal crime

    0:43
    These people are attempting to intimidate essential workers by pretending to work for a bogus federal agency.
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    1 retweet 1 like
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  18. Retweeted
    Aug 8

    Here's the payroll tax one. It's a deferral. That means either employers will continue to withhold your payroll taxes and you won't see any difference, or they won't withhold (unlikely), and you'll have it all withheld from your paycheck when the deferral expires at year-end.

    32 replies 691 retweets 1,025 likes
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  19. Retweeted
    Aug 8

    Dear Journalists, Trump’s new order on payroll taxes *only postpones* their withholding and payment. The taxes will still be due later unless Congress changes the law. See

    4 replies 32 retweets 57 likes
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  20. Retweeted
    Aug 7

    I was taking care of a patient the other day who was very seriously injured. And I stepped out to talk to his family briefly and give them an update. For context, he was Black. I told them what was going on quickly and asked if they had any questions. And this is what they said.

    1,173 replies 33,359 retweets 102,486 likes
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  21. Retweeted
    Aug 8

    “In most cases there are no evaluation metrics in place to measure behavioral change or impact (from learning) on business performance. Most companies could shut down 80% of their training and yet feel zero effect." ceo,

    9 retweets 14 likes
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