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With no access to crypto, disgraced FTX founder Sam Bankman-Fried is now trading fish to pay for services in prison
(www.businessinsider.com)
This is a most excellent place for technology news and articles.
There is a book about extreme economies. The author discusses it here: https://www.econtalk.org/richard-davies-on-extreme-economies/
They go through how the mackerel as money came about. Also, that expired mackerel, i.e. fiat, have their own lower exchange rate.