A complete Radon Removal System costs about $800-2k here at Midwest. Cobra can buy a detector to see how high the Radon Level is before deciding if a complete system is necessary. I have bought one 2 weeks ago (http:// www. amazon.com/gp/product/B000CEAY64/ref=ox_ya_os_product[/url]) and it is really helpful...
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Xing, how do you know if GS is selling on behalf of its clients? Say, if client wants to buy 1000 contract from GS, GS is buying 1000 to hedge since GS is market maker.