(Bloomberg) -- China’s first polysilicon futures debuted on Thursday, as a new hedging tool for a market that has been contending with massive price volatility.Most Read from BloombergHo Chi Minh City Opens First Metro Line After Years of DelayThe first day of trading on the Guangzhou Futures Exchange saw prices for the solar-making material on the most-active June contract rally to their upper limit of 44,000 yuan a ton after producers pledged to cut output. The market ended 7.7% higher at 41,5