MEXICO CITY -- Competition between Mexico's two biggest banks is heating up as they learn the rules of shareholder accountability and jostle with each other ahead of an eventual showdown with foreign banks.

Banco Nacional de Mexico, better known as Banamex, and its rival Bancomer have roughly 60% of the nation's deposits and loans between them. With $30.5 billion in assets at yearned 1991 Banamex was less than $1 billion ahead of Bancomer.

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