Hi
In Betfair's Terms and Conditions
Section D Gaming
36 to 39 Exchange Games
"39. Provision of liquidity
In order to ensure that there is sufficient liquidity to provide an attractive customer proposition, Betfair Games Limited reserves the right to provide liquidity into Exchange Games markets. Where it provides such liquidity, it does so in accordance with Betfair’s terms and conditions, its relevant operating licences and the approval of the relevant regulating authorities."