A white paper and cost model, produced by consulting group Wireless 20/20 and analysts at Heavy reading, reaches the clear conclusion that MNOs will end up buying extra Wi-Fi capacity from ISPs on a pay-as-you-go basis. They will be motivated to do this because the cost will be so much less than building the extra capacity themselves, once there are marketplaces to support this flexible approach to capacity. A pioneering exchange, BandwidthX, is the focus of the report, as it provides a marketplace to bring what it calls ‘Dark Wi-Fi’ from ISPs to MNOs. Companies with access to unused Wi-Fi, usually in the form of homespots or the spare capacity in amenity Wi-Fi hotspots, can use the marketplace to connect…