The lack of reliable statistics and production information for China's steel industry. The World Steel Association says China's steel production went up by 7.5% in April 2011 over the prior year. In 2010 it says China produced 625 million metric tons. These figures are based on information from the China Iron and Steel Association, which represents 75% of steel producers in the country. Because much of the reporting is voluntary many smaller producers do not report their production figures. MEPS, a steel consulting firm in the U.K. , says there is extensive underreporting because of political pressure on inefficient mills to shut down. These mills continue to operate but fail to report production, as a result production may be understated by 45 million tons, according to MEPS. This becomes important because if the Chinese economy slows down much of the steel warehoused in China because of higher taxes on raw steel exports could end up being exported. Inventory levels are higher in China because of the taxes and the storing of steel by mills slated for closure but still operating. This would cause a drop in steel prices on world markets. Steel is different from other commodities in that it is not traded on the London Metals Exchange or other Exchanges. Sales are privately negotiated sales between steel mills and users such as auto plants....