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			 The selloff saw the CSI300 index of the largest listed companies in 
			Shanghai and Shenzhen lose 7.0 percent before trading was suspended, 
			its worst single-day performance since late August 2015, the depth 
			of a summer stock market rout. 
			 
			The collapse, which followed the release of weak economic data on 
			Monday, raises fresh doubts about regulators' capacity to wind back 
			heavy trading restrictions implemented in the wake of a massive 
			summer stock crash in which major indexes lost as much as 40 percent 
			before top leadership intervened. 
			 
			In fact, many analysts attributed the decline to the imminent end of 
			a 6-month lockup period on share sales by major institutional 
			investors, a policy implemented to shore up indexes in the wake of 
			the crash. 
			 
			"This is quite unexpected," said Gu Yongtao, strategist at Cinda 
			Securities. 
			
			  
			"The slump apparently triggered intensified selling, while the 
			trigger of the circuit breaker seems to have heightened panic, as 
			liquidity was suddenly gone and this is something no one has 
			experienced before. It was a stampede." 
			 
			Haitong Securities analysts had earlier estimated that up to 1.24 
			trillion yuan worth of shares would be freed up for sale by next 
			Monday, assuming the lockup period is not extended. 
			 
			CONFIDENCE DASHED 
			 
			China's response to the summer market crash was seen by many inside 
			the industry as heavy-handed, as it included suppression of futures 
			and derivatives markets and instilled an atmosphere of fear at 
			brokerages as regulators pulled in executives for questioning about 
			insider trading and "malicious short-selling." 
			 
			While that stabilized indexes, it also suppressed volumes and poured 
			cold water on foreign investors, who began moving out of Chinese 
			shares. 
			 
			However, authorities recently showed signs they believed indexes had 
			stabilized, in particular by allowing initial public offerings (IPOs) 
			to resume in November, a vote of confidence given it was a flood of 
			IPOs that was blamed for setting off the crash in the first place. 
			 
			The circuit breaker mechanism, which halts trade for 15 minutes if 
			the CSI300 index falls or rises 5 percent in a day, then suspends 
			trade for the day if it continues to fall or rise to 7 percent, is a 
			new measure that came into effect Monday and was put to test 
			immediately. 
			 
			Chinese individual shares had already been subject to a 10 percent 
			intraday trading range. 
			 
			However, Monday's performance caused some analysts to doubt the 
			efficacy of the new measure. 
			
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			"Without the circuit breaker mechanism, the market wouldn't have 
			dropped so much," said David Dai, Shanghai-based investor director 
			at Nanhai Fund Management Co. 
			 
			"The mechanism deepened investor panic, and limited trading." 
			 
			Dai added that the circuit breaker would actually embolden market 
			bears, as they don't have to worry about a late-session rebound. 
			 
			"This mechanism should be scrapped, or at least modified." 
			Market reforms put on hold by the crash could be delayed further if 
			the circuit breaker fails to halt selling pressure and markets - 
			which had recovered more than 25 percent from the pit of the crash 
			prior to Monday's correction - head lower again. 
			 
			A selloff could pressure stock regulators to re-freeze IPOs to 
			preserve liquidity, to extend the share lockup to prevent more 
			selling, and keep the "national team" of brokerages and fund 
			management firms on the hook to keep buying and holding stocks at a 
			loss. 
			 
			It could also further dent confidence in the China Securities 
			Regulatory Commission (CSRC) and of the wider financial regulatory 
			framework to manage increasingly complex markets even as China's 
			economy struggles against major headwinds. 
			
			  
			 
			Another retreat would likely bolster the case for the creation of a 
			"super regulator" that would step to manage the CSRC and other 
			related regulators to improve coordination. 
			 
			(This story has been refiled to add dropped word "prior" in the 
			fourth to last paragraph) 
			 
			(Reporting by the Shanghai Newsroom; Editing by Sam Holmes) 
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