Growth rates at the two bank card associations again climbed well into  double digits in the second quarter as consumers showed no sign of letting   up on their credit habit.   
Visa U.S.A. said its consumer payment volume jumped 28.5% in the second  quarter, to $69.7 billion. It was the eighth consecutive quarter in which   the growth exceeded 20%, and Visa continued to gain market share against   MasterCard.     
  
MasterCard International, which was growing faster than Visa during the  cobranding boom in 1992 and 1993, reported Monday that its U.S. credit and   debit card payment volume grew 17.5% in the second quarter, to $48.7   billion.     
Visa U.S.A. was up 33% in the first quarter to MasterCard's 22%.
  
The rapid growth continues at a time when consumers are borrowing more  and paying back less. A recent analysis by PaineWebber Inc. found that   national consumer debt levels, led by increases in installment borrowings,   are approaching peak levels. Debt payments as a percentage of income have   stabilized.       
While total consumer debt as a percentage of disposable income is  rising, people's ability to manage debt is also improving, said Carl   Pascarella, president of Visa U.S.A.   
Even so, he said, consumer debt trends need to be watched. "It's  certainly something we want to keep looking at - delinquencies and   chargeoffs absolute and as a percentage of volume."   
  
With more credit and debit cards in their wallets, consumers are feeling  more in control of their payment options and therefore are less likely to   become overextended, said Daniel T. Murray, senior vice president of   MasterCard's credit products group.     
"Consumers are looking at the convenience factor," he said. "We see  cards as a payment mechanism for convenience." 
In fact, the card associations have found that convenience is the main  reason for growth. Cards are being used at supermarkets, gas stations,   doctors' offices, and theaters.   
The goal is to replace cash and checks, which account for some 80% of  all payments. "That's where the opportunity is," Mr. Murray said. 
  
Visa tracks this by measuring card usage against personal consumption  expenditures. In the last six quarters, Visa's personal consumption   expenditure share moved 1.6%, Mr. Pascarella said, or about $90 billion.   
The number of Visa credit and debit cards in the United States rose  22.4% in the second quarter, to 227.8 million. MasterCard's U.S. region saw   18.4% growth in cards, to 159.3 million.   
Both associations reported explosive gold card growth. Visa Gold volume  rose 45.3%, to $35.4 billion, while Gold MasterCard jumped 31%, to $18.9   billion.