I think you're missing the point. Trading and Sales used to be people intensive, in today's parlance, 'high touch.' You had people talking deals on the phone, y

I think you're missing the point. Trading and Sales used to be people intensive, in today's parlance, 'high touch.' You had people talking deals on the phone, you had transactions sent to the exchange where a floor trader did the execution, you had a trader's assistant fill out the trade ticket and submit it manually to the mid-office, where you had a person who recorded the transaction then passed it to the back office, where yet more people processed and settled the trade. All of those people are gone. No need, we have automated much of this deal cycle. Your best example is to take a trip to your local exchange floor, which used to be littered with runners, assistants, floor traders, etc. It's eerily quiet these days, as most trades are executed by computers.