Equity markets in the United States suffered their second consecutive month of volume dropping more than 20% compared to a year ago, according to the Equity Research Desk in Greenwich, Conn.

Volumes in cash equities were down 25% in September, overall, the provider of statistics and fundamental analysis of global capital markets said. Tape A, which tracks New York Stock Exchange listings, was down 29%. Tape B, which tracks NYSE Arca and NYSE Amex listings, was down 20%, and Tape C, which tracks Nasdaq listings, was down 16%.

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