A study that measures the average monthly gross commission fetched by full-time brokers at banks found productivity fell 6.6%, to $23,946 in September, continuing its recent slide.

But an index that measures bank brokerage revenue increased two points in September, to 97, according to the study by Kenneth Kehrer Associates Inc. of Princeton, N.J., which was done for the Bank Securities Association.

The figures partly reflect lackluster sales of long-term mutual funds in September, the bank securities group said. Total sales, which includes reinvested dividends, fell 0.22% from a month earlier, to $92.6 billion, the Investment Company Institute reported. -- Cheryl Winokur

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