Viropro, Inc. (VPRO)

[rickkei]

okay lets look at it this way - there's a bid at 1 dollar and there's an ask at 2.00 dollars. so if the next transaction is at 1.00, that means someone on the ask side folded and thus a sale, but if the next transaction was at 2.00, then that means someone at the bid of 1 dollar decided to up his amount to 2, which results in a buy. got it?