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The Joint Effect of Social Comparison and Social Distance on Evaluation of Intertemporal Choice Outcomes in Event-related Potential Studies

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Technical comment on "Fairness considerations in global mitigation investments".

Gregor Semieniuk¹, Jayati Ghosh¹, Nancy Folbre¹

¹Political Economy Research Institute and Department of Economics, University of Massachusetts Amherst, Amherst, MA 01003, USA.

Science (New York, N.Y.)

|May 18, 2023

Summary

Global investment capability estimates for developing nations are overestimated. Using market exchange rates, not purchasing power parity, reveals a much larger need for international climate finance to fund mitigation investments.

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Area of Science:

Environmental economics
Climate finance
International development

Background:

Pachauri et al. (2022) analyzed fair regional shares of global mitigation investments.
The study estimated developing countries' investment capability using GDP adjusted for purchasing power parity (PPP).

Purpose of the Study:

To critique the methodology used by Pachauri et al. regarding developing countries' investment capability.
To argue for a revised estimation of interregional finance flows based on market exchange rates.

Main Methods:

Analysis of GDP estimation methods for international finance flows.
Comparison of purchasing power parity (PPP) exchange rates versus market exchange rates (MER) for investment goods.

Main Results:

Estimating GDP using PPP exchange rates significantly overestimates developing countries' investment capability.
Capability-based interregional finance flows should be substantially larger when using MER for internationally sourced investment goods.

Conclusions:

The methodology in Pachauri et al. (2022) inflates the perceived investment capacity of developing nations.
Accurate assessment of climate finance needs requires using market exchange rates for international transactions.