(13)In order to reinforce the price formation process and to maintain a level playing field between trading venues and systematic internalisers, Article 14 of Regulation (EU) No 600/2014 requires systematic internalisers to make public all quotes in equity instruments where those systematic internalisers deal in sizes of up to the standard market size. Systematic internalisers are free to decide at which sizes they quote, provided that they quote at a minimum size of 10 % of the standard market size. That possibility, however, has led to very low levels of pre-trade transparency provided by systematic internalisers in equity instruments, and has hampered the achievement of a level playing field. It is therefore necessary to require systematic internalisers to make public firm quotes on the basis of a minimum quote size to be determined by means of regulatory technical standards. When developing those regulatory technical standards, it is appropriate for ESMA to consider the following objectives: increasing the pre-trade transparency of equity instruments for the benefit of end-investors; maintaining a level playing field between trading venues and systematic internalisers; providing end investors with an adequate choice of trading options; and ensuring that the trading landscape in the Union remains attractive and competitive both domestically and internationally. In order to increase the competitiveness of systematic internalisers, they should be allowed to match orders of any size at midpoint.