Digital markets have raised a number of new competition challenges. Ex-post competition policy appears not to be able to address them in their entirety and with the necessary speed. There is considerable consensus, among academics and policy-makers, that ex-ante regulatory policies are needed to avoid competition being stifled in these markets, with a negative impact on productivity and innovation. As a result, major OECD economies are discussing or have approved regulatory proposals with the aim to foster contestability and fair trade in digital markets.