An intermarket sweep order (ISO) is a limit order that automatically executes in a designated market center even if another market center is publishing a better quotation. An investor submitting an ISO must satisfy order protection rules by concurrently submitting orders to the markets with...

An intermarket sweep order (ISO) is a limit order that automatically executes in a designated market center even if another market center is publishing a better quotation. An investor submitting an ISO must satisfy order-protection rules by concurrently submitting orders to the markets with...

An ISO is a limit order designated for automatic execution in a specific market center even when another market center is publishing a better quotation, as long as the trader submits concurrent orders to the other market. We find that ISOs represent 46% of trades and 41% of volume in our sample....

In a single market, liquidity supply has two dimensions--price measured by the quoted spread, and quantity measured by the quoted depth. A third liquidity dimension, market breath, should be added when multiple markets quote the same security and there are enforceable regulatory penalties for a...