When I learned about high-frequency trading, I toyed with the idea of opening up a stock-exchange with different rules:

- one quote per day - transactions of the day are processed in a random order (using a provable random deterministic algorithm) - shares have to be kept for at least 3 months (Warren Buffet recommends 6 months) before being sold.

When Steve Jobs died, which was obviously an event that would have an impact on Apple's shares, the quotation was suspended for a day, so that people could take their time to evaluate the significance of the event. This was a confession that they knew that the high frequency changes is just noise and that the signal has a lower time resolution of about a day.

The prospects of future profits do not change every nanosecond.