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polistra's avatar

The neat catch of 4s and 5s brings up a bigger problem. Most traders now are dealing with huge quantities of minuscule fractions. When you can pile up billions of arbitrages per minute, a millionth of a cent can accumulate fast. The bitcoin world concentrates in this direction, taking advantage of ordinary people who think they're math whizzes. Before HFT, each trade took minutes or hours to get through a broker and a NYSE floor trader, so there wasn't as much reason to deal in infinitesimal fractions.

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