The US must not unilaterally impose limits on the trading positions that traders may take in oil and commodity futures and should enlist the support of the G20 to crack down on speculation, a top regulator warned on Thursday. The comments by Michael Dunn, a commissioner at the Commodity Futures Trading Commission, is significant as Dunn carries a “swing” vote at the CFTC, whose other four commissioners – including chairman, Gary Gensler – appear split on the issue of imposing caps on holdings.
