If you need to sell some stock or commodity within a second of buying it, then something is wrong
Oh, yeah? Then, please, tell me in your infinite wisdom how long I should wait? Ten years? Twenty?
The fact is that ANY delay in a feedback system tends to destabilize it. In mechanical systems this is called "backlash" and there is extensive research on how to eliminate it and cope with the problems it causes. Anyone who proposes to artificially introduce backlash in a feedback system know nothing about what he is talking about.
In a market it would be trivially easy to manipulate prices if an artificial delay were involved, especially for the bigger traders. Put a buy order for a million shares and watch the prices rise, then sell at the higher price that would result a half second later. The same principle would work no matter how long the delay is.
Markets work so well because there is negative feedback in many different loops all over the economy. Some of these loops have shorter response times, other are slower to respond. If you invent an artificial delay that overlaps everything, this creates a well defined eignevalue that anyone with the proper technical knowledge could exploit.