Should we establish ex ante economic regulation of ‘digital platforms’, with or without ‘enhanced’ competition law – and what form should any regulatory structures take? This question is a pressing priority for policymakers and competition authorities in many jurisdictions, including the UK and across the EU. We can all see the extent to which services offered by digital platforms (large and small, generalised and highly specialised) now mediate most distanced interactions between people and/or organisations, whether it is economic, in civil society or in our private lives. The aim of this work is to foster contributions to the policy debate concerning the economic regulation of digital platforms. The anticipated focus is on economic regulation specifically, meaning ex ante rules designed to rectify market failures or abuses rather than, for example, regulation of online content or political speech). However, it may be that some areas of research necessarily involve ‘cross-over’ questions between economic and non-economic regulatory issues.