Does ARCA still use the same order logic that it used to? I bought a stock through ARCA and paid 18.75, while the market was right around 18.67. I even checked time and sales, and my trade of 18.75 was surrounded by a bunch of trades around 18.67-18.68. I would think that I would get the best price, whether it had to go to another ECN, a market maker, or whatever.