Most orders are cancelled: http://www.bloombergview.com/articles/2015-10-08/why-do-high-frequency-traders-cancel-so-many-orders- http://www.bloombergview.com/ar

Most orders are cancelled: http://www.bloombergview.com/articles/2015-10-08/why-do-high-frequency-traders-cancel-so-many-orders- http://www.bloombergview.com/articles/2015-10-08/why-do-high... >Exchanges advance the interests of traders by sponsoring esoteric order types, which for hard-to-understand reasons receive the approval of the S.E.C. An example is the New York Stock Exchange Day Intermarket Sweep Add Liquidity Only Order. Regular investors have no idea such an order type exists or what it means. Then they have no need to use it. Does anyone think we should cut out little used parts of programming languages, because "regular programmers" have little need for them? When did "it's complicated, therefore it's unethical" become a valid argument?