求翻译：Most of the institutional brokers not only facilitate transactions in the equity markets, but also trade in fixed income, commodities, derivatives, and other financial instruments, which should diminish any impact in lower equity volumes. Furthermore, a change in interest rates may cause many institutions to increase trading activity as they adjust to a movement of a major market indicator. Also, higher interest rates should help some of these companies' return on client assets. Several institutional brokers rely on higher interest rates for a better return on client assets.是什么意思？

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