Correction
In an article dealing with Mexico's external debt published Sept. 9, the Monitor used some estimates of The Economist's Financial Report on the exposure of various United States commercial banks to Mexican borrowers. First National Bank of Boston was said to have loaned $500 million to $1 billion. Bank officials say that this is far too high and that the bank's exposure does not exceed $250 million; that is, less than one-half the range cited in the article.