(Bloomberg) -- Hedge funds raised commodity bets in the longest bullish streak in three years as speculation that policy makers will increase economic stimulus drove prices toward the biggest monthly rally since October.

Money managers raised their net-long positions across 18 U.S. futures and options by 3.4% to 1.17 million contracts in the week ended July 24, U.S. Commodity Futures Trading Commission data show. Wagers gained for seven weeks, the longest increase since June 2009. Corn bets climbed to the highest since September 2011, and traders are the most bullish on natural gas since October 2006.

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