During the 1980s the number of banks and building societies charging issuer fees (i.e. charging fees to their own customers when they used another operator's cash machines) gradually increased. However, in 1990 Barclays announced they were introducing an acquirer fee for all non-Barclays cardholders at their cash machines. This would result in "double charging", where the customer was charged by both their card issuer and the machine operator.