The SpendingPulse report measures sales at retailers with annual revenue of less than $35 million and fewer than 200 employees.
Small retailers are considered a critical part of the economy because they account for more than $100 billion in sales every month in the U.S.
MasterCard and Wells Fargo compile their figures from payments made through the MasterCard processing system as well as estimates of other types of payment, including cash and checks. The sales come from more than a million retail locations. The data is used to project estimates for small business spending overall, not just transactions involving MasterCard.