Even during the Dot Com Boom of the 1990's.
There was HFT. There were very fast market's back then too. So they been around for a long time.
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Replying to @MasterBJones and @traderbjones
You’ve traded for quite some time. How much of an impact have HFT’s, algo’s etc made on your strategy… was the market “simpler” or more predictable prior to the introduction of that?