Where is American Express card not accepted?
Where is American Express card not accepted? While most places in the U.S. do take Amex, it's worth keeping in mind that some major retailers, like Costco, don't accept it. At Costco, your best bet is the $0 annual-fee Costco Anywhere Visa? Card by Citi*, which doubles as a membership card with cash-back benefits.
Why is Amex not accepted in UK?
Because American Express charges companies big fees. And retailers would sooner not give away so much of their profit to a card company, especially when almost everyone in the UK who has Amex also has some other way to pay so it's not like retailers lose the sale over it generally.