Initial feedback from billers reassured Black that they were strongly in favor of converting their consumers from receiving paper bill to receiving e-bill. This enthusiasm was driven in great part by the significant financial saving offered by e-billing. Billers sent monthly bills to consumers. Processing and sending each of these paper bill cost an average of $1.25 per bill, and billers saved up to 45 percent per bill for consumers who no longer received the paper bill. Furthermore, a comparison of sample consumers who received paper bill versus a similar sample of consumers who used e-billing showed that the latter made 10 to 20 percent fewer calls to customer service, thank mainly to the reduction of payment claims cause by human error in submitting and processing transactions. This created additional annual saving of $2 to $4 per consumer for billers, regardless of whether the e-bill consumer was still receiving paper bills.