The severing of JPMorgan Chase & Co. and Starbucks Inc.'s cobranded Duetto credit card relationship is another sign of the industry's refocusing on core products.

Last week JPMorgan Chase mailed letters to its Starbucks Card Duetto Visa cardholders informing them that the partnership between the banking company and the coffee chain was ending. The Duetto card is unusual in that it has a dual-purse function — it can be used as a credit card and as a stored-value card for Starbucks points redeemable for Starbucks purchases at the point of sale.

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