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I did a quick calculation. If you assume all of the U.S. energy consumption goes into stocks and forex trading (the only numbers that were easy to google quickly), dollar trades are about the same dollars traded per kWh as bitcoin, maybe a tad worse.

In actuality, there are more dollar transactions that doesn't include, so the numerator is bigger. It also uses much much less than the total U.S. energy consumption, so the denominator is much much smaller.

A bigger numerator and much much smaller denominator tells me that bitcoin is much much less efficient than traditional systems in dollars traded per kWh.