Here are the links that works

送交者: k19 2009月02月13日20:51:36 于 [股市财经] 发送悄悄话

回  答: two random walks 由 扫盲教育 于 2009-02-13 20:36:33

Lots of home works: http://www.pbs.org/nbr/info/local-player.html?s=nbre07s1f57q508 http://www.pbs.org/nbr/info/local-player.html?s=nbre07s1ebeq508 http://www.pbs.org/nbr/info/local-player.html?s=nbre07s1ebeq508 http://www.pbs.org/nbr/info/local-player.html?s=nbre07s1ebeq508 http://www.pbs.org/nbr/info/local-player.html?s=nbre07s1f57q508

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