On the one hand, households are obligated to pay only a minimum amount and thus, in times of financial stress, a household can forgo making more than this minimum payment. On the other hand, we know that many households make more than the minimum payment and indeed likely would be quite uncomfortable paying only the minimum amount.
During financial difficulties, these households might even consume less to pay more than the minimum. Defining the point at which households feel they should pay down their credit card debt is difficult, and thus our measure of debt service relies on estimates of minimum payments required by credit card lenders.