Clearly without a study it would be impossible to determine whether the upfront complexity of designing and installing specialized credit card equipment would b

Clearly without a study it would be impossible to determine whether the upfront complexity of designing and installing specialized credit card equipment would be more or less than the comparatively small complexity of counting out coins. Walmart, for instance, now uses a system that dispenses the coin change automatically so that the person at the cash register doesn't even have to do it themselves.