126 Constraints
One measure which has been implemented by the Deusche Börse and the London
Stock Exchange is to charge HFTs for high order- to- trade ratios. It comes close
to the last listed proposal and also aims to address the concern of possible market
manipulation.
5.2.2.2.2 Negative feedback loops
The concern, which applies more to AT than to HFT, is that algorithms would
react blindly to price changes. In particular, the responsibility of HFT in “ash
crashes” (i.e. abrupt short- lived price swings) is systematically put forward in the
media. However, Kirilenko etal. (2017) examine the ash crash that took place
on 6 May 2010 in US nancial markets, especially impacting the Dow Jones In-
dustrial Average which dropped almost 1,000 poi ...