I was talking about the rent part on top of the costs of those systems, nonetheless they are trivial compared to the revenues. If there was an international agr

I was talking about the rent part on top of the costs of those systems, nonetheless they are trivial compared to the revenues. If there was an international agreement on a single payment system with mandated interoperability, we could find out what those costs actually are in a competitive market, probably fractions of a cent per transaction.