This background paper from Maury Obstfeld

https://eml.berkeley.edu/~obstfeld/SDR_Obstfeld.pdf
A thread of some relevant resources that I found useful:

1) From Ted Truman, proponent of the SDR allocation in 2009, and proponent now
https://www.piie.com/blogs/realtime-economic-issues-watch/imf-will-need-more-resources-fight-covid-19-pandemic
2) From Kevin Gallagher, Dr José Antonio Ocampo & Dr Ulrich Volz (also advocates) who see an SDR allocation as an opportunity to increase the role of SDRs

http://ftalphaville.ft.com/2020/03/20/1584709367000/It-s-time-for-a-major-issuance-of-the-IMF-s-Special-Drawing-Rights/
Now for some sceptics

4) @sobel_mark, who *KNOWS* how the system works, argues that "given more practical realities, the case for an allocation is neither sufficiently strong nor compelling." Other policies would be more effective/efficient.

https://www.omfif.org/2020/03/coronavirus-sdr-allocation-not-the-answer/
5) Ousmène Mandeng, another sceptic, who looks at whether governments converted their SDRs into cash.

https://www.economicsadvisory.com/comments/20-03-20-SDR-allocation.html
Some figures from @SergiLanauIIF, who points out that an allocation would be too small to matter for EMs, but could make a difference in some African countries

https://www.iif.com/Publications/ID/3840/Economic-Views--EM-Funding-Needs-in-the-COVID-19-Shock
THANKS to everyone listed and everyone who spoke to me on background.
PS though my sources were (slightly) more diverse than this list suggests, I would be VERY grateful for all suggestions to make them more so.
You can follow @SoumayaKeynes.
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