In every market--and at every step from suppliers of raw materials to consumers of finished goods--faster, cheaper communication lowers the costof producing and consuming.
While the regular IT industry catered to the global needs of cost-effective software and business processing, mobiles served the communication needs of average Indian citizens.
The second is that merely adding a website on to an existing business is not enough: the whole business needs to be redesigned around the cost-saving, communication-easing properties of the net.