AmEx spending picked up at year-end, thanks to younger cardholders newsthirst.
Silas Stein | Picture Alliance | Getty Images American Express’ affluent cardholders got comfortable spending more freely again late last year, Chief Financial Officer Christophe Le Caillec told CNBC. Spending on AmEx cards jumped 8% year over year in the fourth quarter after slowing from a 7% growth rate early in the year to 6%…