(6)Cases where there is no mandatory requirement for trading venues to set out a market making scheme taking into account the nature and scale of the trading on those trading venues should be clearly identified. To this end, it is appropriate to identify financial instruments and trading systems that increase the risk of high volatility and for which it is crucial that the provision of liquidity is incentivised, in order to ensure orderly and efficient functioning of markets. In this respect, this Regulation should take into account that when certain liquid instruments are algorithmically traded in continuous auction order book trading systems there is a greater risk of overreaction to external events which can exacerbate market volatility.