Loopy wrote:
-- keep a last 5 or last 10 average -- justadd one fifth or one tenth of the most recent sales price to four fifths or nine tenths of the last 5 or last 10 average. Instant rolling average with a single field addition.
This would be much more useful than the last price, but I think even better would be to have both last price and the average of 5 or 10 prices before that - actually, that's probably what you meant. Then it would be easier to see if someone's trying to manipulate the prices by selling to himself. An all-time average could be nice too.