The global crisis triggered a vast programme of financial markets reform, including a new regime for over-the-counter (OTC) derivatives which requires hitherto private contracts to be cleared through central counterparties (CCPs). This article argues that the interaction between underlying law and this new regulation needs to be addressed in order to advance the objectives of the reforms. The starting point for the argument is the two techniques that underpin CCPs: limited access and posting assets, or margin. Having established that access via intermediated or 'client' clearing will become increasingly important with mandatory clearing, the article explores the impact of client clearing on the legal rules governing the margin posted by users of a CCP. The detail of the interaction between European regulations on CCP clearing and the UK rules on client assets is considered as an example. The dilemma identified arises because regulation, designed to improve financial stability by mandating clearing, may potentially undermine certain ways in which CCPs promote that outcome. The article concludes that the interaction between underlying law and new regulation needs to be accounted for and addressed at EU level, in order to safeguard the functions that attracted regulators to clearing in the first place.
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