Commercial ISS Modules?

Have the administrators of the ISS (NASA? ESA?) considered commercial
modules? If the ISS is just a series of interconnected modules, why not
allow commercial agencies to build modules and add on? Seems like it could
raise some serious cash for the project and stimulate marketing and
interest.

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BenignVanilla
Pond Site: www.darofamily.com/jeff/links/mypond
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