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A couple of million transactions per day: https://www.statista.com/statistics/730806/daily-number-of-b...

That's less than the number of private transactions in a moderately sized city, never mind business or financial transactions.

Random comparison: NASDAQ alone sees 30-40 million transactions per day. http://www.nasdaqtrader.com/Trader.aspx?id=DailyMarketSummar...



It’d be real interesting to do an analysis of the last mile power usage of the credit card networks / banking system. I wonder if the giant volume and ubiquity of credit card terminals tips the scales.




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