Wheat was today's market leader with gains of 7-9 cents for SRW, HRW and HRS futures. Lowering world wheat prices are attracting demand. General Comments The important role that China now plays in the world economy was underlined today when HSBC put China's preliminary January Purchasing Manager's Index (PMI) at 49.6 versus December at 50.5. A PMI below 50.0 is seen as representing economic contraction, and this caused quite a negative reaction in world financial markets. U.S. and world stock markets were broadly lower with the Dow off 176 points for a third straight day of losses. Initially, the USD also fell on the news, but most other currencies later dropped even further. It was sort of a race to the bottom, so the USD index actually...