US plans for an aggressive crackdown on energy speculation are in danger of unravelling, with leaders at the US commodity regulator raising doubts about proposed reforms.
Two of the Commodity Futures Trading Commission's five commissioners have voiced worries that proposals to cap investors' holdings in oil and commodities futures could drive trading from US exchanges.
A third commissioner, who had been the most outspoken supporter of new limits, now says they should be set at generous levels, in effect softening any clampdown.
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