Natwest are also swapping to MasterCard debit once cards expire. I just presumed the issuing bank had negotiated a more favourable interchange rates than using

Natwest are also swapping to MasterCard debit once cards expire. I just presumed the issuing bank had negotiated a more favourable interchange rates than using Visa. (MC taking less of a cut of the final fees then Visa, so the banks getting a higher precentage of the fees then they would have sticking with Visa. Lets say MC gave away 5% of their cut to the banks, keeping 95% of the your slice of the pie when you are processing more pies is more than 100% of your slice of fewer pies if you get what I mean).