nearest to the pin after 54 and 58 assays, page-24

Trade settled on Chi-X Australia instead of ASX. Chi-X is an exchange that behaves almost identically to the ASX. As a retail investor you won't even know its happening, but all brokerage firms have a best execution policy. eg You want to buy 100 CBA shares. You click order. The broker's software checks whether it is cheaper to buy on ASX or CHI-X and fills the cheapest. If you were an actual trader with more sophisticated software you can dictate which exchange you want to trade on. As a result of Chi-X the ASX had to bring down fees to remain competitive.