Admitting that it “no longer has the economies of scale to profitably grow its portfolio”, Comerica Bank is selling off its credit card portfolio to MBNA. Both firms made the announcement Wednesday. MBNA America will acquire Comerica’s check-accessed line of credit services as well as Comerica’s credit card portfolio. Both portfolios have combined assets of $500 million. Comerica’s credit card portfolio currently has approx. $325 million in card receivables, annual charge volume of $700 million and 265,000 accounts, according to CardData ([www.carddata.com]). The deal is expected to close by March 30. Comerica will become an agent of MBNA. Comerica joins the steady stream of regional players who have exited the credit card business over the past two years.