Question A:
Considering a broad range of costs and benefits is a better tool for guiding climate policy than setting temperature limits (such as 1.5 °C , eg) based on expected links between temperature increases and the extent of environmental harm.
Responses
Responses weighted by each expert's confidence
Question B:
Carbon taxes are a better way to implement climate policy than cap-and-trade.
Responses
Responses weighted by each expert's confidence
Question A Participant Responses
| Participant | University | Vote | Confidence | Bio/Vote History |
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 Daron Acemoglu |
MIT | Bio/Vote History | ||
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There is great urgency. We need a redline, and 1.5C is as good as any, esp taking into account consequences of greater rises for some areas.
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 Alberto Alesina |
Harvard | Did Not Answer | Bio/Vote History | |
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 Joseph Altonji |
Yale | Bio/Vote History | ||
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The economist in me wants to answer "yes", but the right answer is as much about politics and persuasion as about economics
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 Alan Auerbach |
Berkeley | Bio/Vote History | ||
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 David Autor |
MIT | Bio/Vote History | ||
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 Katherine Baicker |
University of Chicago | Bio/Vote History | ||
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 Abhijit Banerjee |
MIT | Bio/Vote History | ||
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Its too late and too hard to build s consensus around something more complicated
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 Marianne Bertrand |
Chicago | Bio/Vote History | ||
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 Markus Brunnermeier |
Princeton | Bio/Vote History | ||
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In general cost-benefit analysis is good, but in this case TAIL RISKS matter much more. They need appropriate overweighting.
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 Raj Chetty |
Harvard | Did Not Answer | Bio/Vote History | |
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 Judith Chevalier |
Yale | Bio/Vote History | ||
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 David Cutler |
Harvard | Bio/Vote History | ||
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 Angus Deaton |
Princeton | Bio/Vote History | ||
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 Darrell Duffie |
Stanford | Bio/Vote History | ||
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 Aaron Edlin |
Berkeley | Did Not Answer | Bio/Vote History | |
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 Barry Eichengreen |
Berkeley | Bio/Vote History | ||
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Better for policy makers capable of processing a wide range of evidence and acting on it, worse if you just want a focal point for action.
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 Liran Einav |
Stanford | Bio/Vote History | ||
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 Ray Fair |
Yale | Bio/Vote History | ||
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 Amy Finkelstein |
MIT | Did Not Answer | Bio/Vote History | |
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 Pinelopi Goldberg |
Yale | Bio/Vote History | ||
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 Austan Goolsbee |
Chicago | Bio/Vote History | ||
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 Michael Greenstone |
University of Chicago | Bio/Vote History | ||
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 Robert Hall |
Stanford | Bio/Vote History | ||
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A truism valid across a wide range of policy issues
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 Oliver Hart |
Harvard | Bio/Vote History | ||
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 Bengt Holmström |
MIT | Bio/Vote History | ||
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I would include temperature limits, too, in the range of trade-offs
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 Caroline Hoxby |
Stanford | Bio/Vote History | ||
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 Hilary Hoynes |
Berkeley | Bio/Vote History | ||
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 Kenneth Judd |
Stanford | Bio/Vote History | ||
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A temperature target is an inflexible goal and not responsive to tradeoffs that are part of any policy decision.
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 Steven Kaplan |
Chicago Booth | Bio/Vote History | ||
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 Anil Kashyap |
Chicago Booth | Bio/Vote History | ||
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 Pete Klenow |
Stanford | Bio/Vote History | ||
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I am not aware of evidence that the costs of temperature change rise discontinuously at any one point.
-see background information here -see background information here |
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 Jonathan Levin |
Stanford | Bio/Vote History | ||
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 Eric Maskin |
Harvard | Bio/Vote History | ||
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 William Nordhaus |
Yale | Bio/Vote History | ||
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 Emmanuel Saez |
Berkeley | Bio/Vote History | ||
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 Larry Samuelson |
Yale | Bio/Vote History | ||
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Consideration of a broad range of costs and benefits should lie behind any policy. This may well lead to a temperature limit.
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 José Scheinkman |
Columbia University | Bio/Vote History | ||
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C-B analysis helpful for comparing different mitigation actions but non-linearities and complementarities demand an overall target
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 Richard Schmalensee |
MIT | Bio/Vote History | ||
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Given time horizons, uncertainty, high stakes, cost-benefit analysis is a weak tool; arbitrary limits are not obviously worse.
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 Carl Shapiro |
Berkeley | Bio/Vote History | ||
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Setting temperature limits seems like a fine way of taking a very complex benefit/cost analysis and putting it into practice.
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 Robert Shimer |
University of Chicago | Bio/Vote History | ||
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But in the end, implementing optimal policy might be done in part through temperature targets.
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 James Stock |
Harvard | Bio/Vote History | ||
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The cost-benefit is preferred in principle, but a carbon budget approach can be justified as a robust way to guard against unknowns.
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 Richard Thaler |
Chicago Booth | Did Not Answer | Bio/Vote History | |
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 Christopher Udry |
Northwestern | Bio/Vote History | ||
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Simplicity may dominate nuance here, if it makes it more feasible to coordinate on better policy.
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Question B Participant Responses
| Participant | University | Vote | Confidence | Bio/Vote History |
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Daron Acemoglu |
MIT | Bio/Vote History | ||
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Of course, they are equivalent under ideal conditions. But a predictable price for carbon is very useful for future planning and as a signal
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Alberto Alesina |
Harvard | Did Not Answer | Bio/Vote History | |
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Joseph Altonji |
Yale | Bio/Vote History | ||
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Alan Auerbach |
Berkeley | Bio/Vote History | ||
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David Autor |
MIT | Bio/Vote History | ||
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Katherine Baicker |
University of Chicago | Bio/Vote History | ||
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Abhijit Banerjee |
MIT | Bio/Vote History | ||
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Marianne Bertrand |
Chicago | Bio/Vote History | ||
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Markus Brunnermeier |
Princeton | Bio/Vote History | ||
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Tax preferable since marginal abatement cost curve is uncertain, but steeper than marginal damage curve. Latter is flat since CO2 is a stock
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Raj Chetty |
Harvard | Did Not Answer | Bio/Vote History | |
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Judith Chevalier |
Yale | Bio/Vote History | ||
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Depends. But of course either better than status quo.
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David Cutler |
Harvard | Bio/Vote History | ||
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Angus Deaton |
Princeton | Bio/Vote History | ||
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Darrell Duffie |
Stanford | Bio/Vote History | ||
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Aaron Edlin |
Berkeley | Did Not Answer | Bio/Vote History | |
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Barry Eichengreen |
Berkeley | Bio/Vote History | ||
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Liran Einav |
Stanford | Bio/Vote History | ||
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Ray Fair |
Yale | Bio/Vote History | ||
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Amy Finkelstein |
MIT | Did Not Answer | Bio/Vote History | |
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Pinelopi Goldberg |
Yale | Bio/Vote History | ||
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Austan Goolsbee |
Chicago | Bio/Vote History | ||
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Michael Greenstone |
University of Chicago | Bio/Vote History | ||
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Robert Hall |
Stanford | Bio/Vote History | ||
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Cap and trade creates rents that could otherwise be tax revenue
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Oliver Hart |
Harvard | Bio/Vote History | ||
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If we know the marginal cost of emissions a tax is better but if we know the optimal quantity cap and trade is better (see Weitzman).
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Bengt Holmström |
MIT | Bio/Vote History | ||
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Caroline Hoxby |
Stanford | Bio/Vote History | ||
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Hilary Hoynes |
Berkeley | Bio/Vote History | ||
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Kenneth Judd |
Stanford | Bio/Vote History | ||
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A carbon tax imposes a uniform carbon price across all emissions. How do you cap my car's annual CO2 emissions? Also, we need the revenue.
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Steven Kaplan |
Chicago Booth | Bio/Vote History | ||
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Anil Kashyap |
Chicago Booth | Bio/Vote History | ||
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i think it is true, but don't know enough to be sure, and suspect the implementation details matter enough to rule out a blanket endorsement
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Pete Klenow |
Stanford | Bio/Vote History | ||
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Jonathan Levin |
Stanford | Bio/Vote History | ||
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Eric Maskin |
Harvard | Bio/Vote History | ||
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William Nordhaus |
Yale | Bio/Vote History | ||
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Many reasons but one important is to get the revenues to recycle to consumers.
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Emmanuel Saez |
Berkeley | Bio/Vote History | ||
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Larry Samuelson |
Yale | Bio/Vote History | ||
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Cap and trade is a reasonably second-best, but a carbon tax is more flexible and potentially more effective.
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José Scheinkman |
Columbia University | Bio/Vote History | ||
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Carbon taxes greatly simplify market-design albeit with risk of missing desired targets. This can be fixed by changing tax rates.
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Richard Schmalensee |
MIT | Bio/Vote History | ||
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In theory, of course; in practice, cap-and-trade can handle equity/political concerns without compromising efficiency, while tax laws can't
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Carl Shapiro |
Berkeley | Bio/Vote History | ||
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Robert Shimer |
University of Chicago | Bio/Vote History | ||
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But whatever can achieve a political consensus is better than the alternatives.
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James Stock |
Harvard | Bio/Vote History | ||
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Price stability, incentives, administrative advantages, clarity. The main plus of cap&trade is politically it hides the costs.
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Richard Thaler |
Chicago Booth | Did Not Answer | Bio/Vote History | |
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Christopher Udry |
Northwestern | Bio/Vote History | ||
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But I'd take either. Or a combination.
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