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I wouldn't be too concerned for the effects on the US market.
L.A. Times, Why China's stock market is tanking
Looking at the chart in the LA Times article, the Chinese market index was at 2,038.6 exactly one year ago, Today it stands at 3,502.7, a hefty increase of 72 percent from July 2014. Although it has declined 32 percent from it's peak of 5,166.4 in June, that peak was obviously speculative.
"Stocks kept rising despite a number of red flags, including a slowdown in China's economy and the fact that share prices had become exceptionally rich compared with many of their companies' underlying earnings. One reason: A growing number of working-class Chinese families bought stocks to cash in on the rally and often did so by buying on margin, a term for borrowing money and using the stocks as collateral."
It looks like the Chinese working class with new savings and wealth is learning the hard way about markets. Greed is not good.