Business-to-business Net market infrastructure spending in the US will grow from $US2.1 billion in 2000 to $US80.9 billion by 2005, according to Jupiter Research. In addition, growth of private Net markets will drive much of the future spending on technology and services required to integrate an enterprise's business partners into a collaborative commerce environment, Jupiter analysts said. The shift towards Net markets by many brick-and-mortar businesses brings to light a number of significant back-end integration issues which translate to huge revenue opportunities for technology and services enablers. Vendor opportunities will increase substantially as Net markets integrate deeper into the supply chain and require more than basic transaction platforms.