ICAP, the world's biggest interdealer broker, reported a pick-up of trading in September and said a potential tie-up between rivals could bring further relief to an industry battered by retrenching investment banks and subdued markets. Interdealer brokers, which match buyers and sellers of currencies, bonds and other tradeable instruments, have seen revenues plunge as banks pull back from risky trading activities to comply with new rules brought in after the financial crisis.
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