I scanned through his paper and see nothing that hasn't been discussed here ad nauseam: not a real money, no intrinsic value, a bubble. Beating a dead horse.

If he came up with something new then please post it here, otherwise I don't see why anyone would care spending time and posting an extensive rebuttal.

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Edit: related:
https://news.bitcoin.com/bitcoiners-shoot-down-roubinis-us-senate-testimony/