Surely possible for someone to call their broker and place an order before 1980? Weren't people doing that from day one of the telephone (~1880)?
Also, what about the telegraph/telegrams, transatlantic cable (for GBP/USD) and ticker tape?
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The evolution of HFT and latency arbitrage ==> http://www.elitetrader.com/vb/showthread.php?t=285311&page=3
later on they financed the wars themselves and so could predict the outcome more easily ..... sorry, no more money to finance your war effort, and we are calling your loans today. Sorry. ............... our customers are important to us, so please stay on carrier pigeon hold ........ estimated wait time is ....... 5 days .....
