Investors monitor screens showing stock market movements at a brokerage house in Shanghai on July 29, 2015.  An 8.48 percent plunge on July 27 -- the biggest in eight years -- renewed fears about the government's management and the health of the underlying economy, in which growth has already slowed to levels unseen since the global financial crisis.      AFP PHOTO / JOHANNES EISELE        (Photo credit should read JOHANNES EISELE/AFP via Getty Images)