Since adding or removing liquidity makes big difference if using IB's unbundled commission structure, I would like to know the following three order types are considered adding or removing liquidity: 1. Discretionary Limit Orders (say you enter a buy limit order with limit price $10 and discretionary amount $0.90. someone offers $10.90 and your order is excuted at $10.90.) 2. Same Discretionary Limit Orders as above, but with a small display size (example: showing 100 shares for a 1000 order). 3. Hidden Orders Thanks