business to business

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I think first of all i will suggest to surf the website www.alibaba.com u can also surf www.tradekey.com u can also surf www.worldbidindia.com all are the example of b2b portals. Now i just wana know as i m a fresher. How much investment is required to develop such portal. Who all can help me to construct and promote such portal? I am looking for the suggestions and ideas so feel free to say whatever u feel or u know.