The US commodity regulator approved sweeping new constraints on speculation in food, energy and metals, in a decision riven along party lines, the FT reports. The limits on the size of positions in futures and swaps markets will curb banks’ and investment funds’ ability to trade commodities, though the rules were watered down after lobbying by Wall Street. The reform will put the US at the forefront of the clampdown on investment in commodities, an increasingly popular bet on global growth and hedge against inflation. Assets under management reached an all-time high of $447bn in August, according to Barclays Capital. The Commodity Futures Trading Commission on Tuesday finalised the rules in a 3-2 vote, with the agency’s three Democrats forming the majority. Michael Dunn, a Democrat, said he reluctantly backed the new limits in order to “follow the law”. Republicans dissented harshly, with commissioner Scott O’Malia suggesting the rule was vulnerable to legal challenge. The European Union is mulling similar caps, but Brussels is unlikely to mandate position limits in the face of intense pressure from London, a key trading centre. Paris is pushing for a global agreement during the Group of 20 summit next month. Read more