[whyhow]

I think this could be fixed by making each job be posted for a fixed block of time, say five minutes. Then it is randomly assigned to one of the shoppers that selected that job. This would remove the incentive around reaction speed and I don't think the customer would care about the slightly increased time for an order.

[jgalt212]

I was here to say the same thing. But you don't even need to extend the time frame to five minutes to defeat the bots. Lisa Marsh, in the article, complained "no human can click that fast." I bet she only needs 10-15 seconds to assess an order.

Not for nothing, this is the same mechanism by which the "unfair" advantages of HFT practitioners can be defeated. Run mini-auctions every whole second and randomly allocate fills if there are ties for best bid and/or best offer.

Of course, as long as the exchanges deeply care about vanity metrics such as trading volume (trading volume !== liquidity) such measures will never be broadly enacted.