The well intended overhaul to provide investors with the best available price when buying or selling stock presents the option of expanding the trade through rule, which links the NYSE, the Nasdaq, regional exchanges and ECNs, allowing investors to execute trades in markets other than the one that originally received the investor’s order.
The proposal gives two options, the first applying the rule to quotes at the top of a market’s order book, the second would apply the same principle to quotes in depth within the order book.
