 The metropolitan area doesn't include the nearby industrial zones of Sholinganallur, Siruseri, Oragadam and Sriperumbudur, due to which these regions' economy doesn't get included in the total economy of Chennai.If these regions are included, the economy of chennai would be somewhere around $167 billion to $210 billion.Chennai has an economic base anchored by the automobile, software services, medical tourism, hardware manufacturing and financial services.