at the peak it was 12% of the total market float. >> that was the boom and when it comes to handling the bust, the parallels continue. on october 24th 1929. otherwise known as black thursday a dproup of top american bankers met in this building 23 wall street. then the headquarters of jpmorgan. they agreed to pull their resources to prop up stock prices. now almost nine decades later, 21 chinese brokerage firms are doing almost exactly the same thing. in china's case the government enlisted its brokers to buy stock to support prices. in 1929 the market crashed again four days later. what happens next in china is open to debate. and leeanne lee is the author of who the u.s. can learn from china. she says in this case the reverse maybe true. >> certainly the china are studying the history there as well with. it is possible it will work in