In the US, most PIN debit card transfers occur via either MasterCard's Maestro or Visa's Interlink debit networks. Signature debit payments go through MasterCard/Visa's credit card networks. So you've still got the duopoly problem.
In the US, most PIN debit card transfers occur via either MasterCard's Maestro or Visa's Interlink debit networks. Signature debit payments go through MasterCard/Visa's credit card networks. So you've still got the duopoly problem.