Chinese stocks surged 8.5% yesterday, marking their best day since 2008, as the country’s official PMI for September came in better than expected. Stocks extended a rally that began last week after policymakers unleashed sweeping stimulus measures to boost growth.

The People’s Bank of China announced cuts to the benchmark interest rate and the reserve requirement ratio, along with reductions in mortgage rates for homeowners and loans to investors and companies to buy back their stock.

The Politburo, chaired by leader Xi Jinping, also pledged more fiscal support to ensure the economy meets the official 5% growth target for the year. These measures suggest the government's focus has shifted decisively to economic growth.

This came after three years of limited support from authorities for the ailing economy, and it remains to be seen whether these measures will be enough to prevent the world’s second-largest economy from slipping into a deflationary spiral.

The stimulus set off an epic rally in Chinese stocks and in sectors exposed to China, including copper, miners, casino companies, luxury goods makers, and European automakers.

Last week, billionaire David Tepper, president of hedge fund Appaloosa Management, told CNBC he was bullish on Chinese equities, saying he has bought "everything" related to China.

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