This leads us to a third evaluation measure using a simulated trading engine that invests $1,000 per trade and follows simple trading rules. The rules implemented by our trading engine are a modified version of those proposed by Mittermayer [2004] to maximize short-term trading profit. Our simulated trading engine evaluates each news article and will buy/short the stock if the predicted +20 minute stock price is greater than or equal to 1% movement from the stock price at the time the article was released. Any bought/shorted stocks are then sold after 20 minutes. This assumes a zero transaction cost which is consistent with the research of Lavrenko [Lavrenko et al. 2000a, 2000b] and Mittermayer [2004] who argue that trading in volume will offset the costs of trading.