BUSINESS DIGEST
Companies Toyota's production techniques at its Kentucky factory are being hailed as a model of how to change the American way of mass production and help factories make everything more efficiently, from cars to copiers, jets to dishwashers. [ Page A1. ] Detroit has been slow to adopt Japanese manufacturing principles. [ D8. ] Visa and Mastercard are fighting a heated battle to sign up banks to issue their debit cards -- the next generation of plastic competing for space in American wallets. [ D1. ]