Zinc fell to a 20-month low in London as shipments from China, the world's largest producer of the metal, grew on speculation its government will end a tax rebate on exports. Copper and lead also dropped. There's an expectation China will remove a 5 percent rebate on zinc exports next year, Michael Jansen, an analyst at JPMorgan Securities Ltd. in London, said today in a report. That probably spurred those holding stockpiled zinc ``to liquidate'' ahead of the change, he said. Exports from China jumped 21 percent in the first 10 months of this year. The metal, used to galvanize steel, has declined 42 percent this year in London, more than other metals traded on the LME
