Friday Fun Fact: How Traders Measure Liquidity

The investment community usually defines a liquid investment as something that can be easily turned into cash.  Selling a house is an example of an illiquid investment.  It could take weeks or months to close on the transaction and receive your money.  Stocks, however, tend to be very liquid because they can be sold on a moment’s notice. Moreover, you can sell large amounts of stocks in seconds and receive your money rather quickly.

Unlike the investment community, futures traders measure liquidity in terms of how easy it is to buy and sell the futures contracts they are interested in. They usually use volume, open interest and a narrow bid/offer spread as primary gauges of liquidity. Futures contracts like U.S. Treasuries and Eurodollars trade millions of contracts a day and have open interest exceeding 1,000,000 contracts or more.

Additional gauges of liquidity would involve examining the depth of order book, how many contracts are bid for and how many are offered (often referred to as size). A futures contract that is one up (one contract bid for and one on the offer) is much less liquid than a contract that is one tick wide and 100-up (100 on the bid and 100 on the offer). Some new, or less liquid, futures contracts might have bid offer spreads of several ticks or more and are only a one-up market.

Traders tend to gravitate toward futures contracts where liquidity is optimal, thus reducing slippage, a primary part of overall transaction costs.

About the Author

David Lerman, the Senior Director of Education at CME Group, gives seminars and workshops to retail and institutional audiences focusing on risk management and trading using Equity Index futures and options.

Mr. Lerman is the author of Exchange Traded Funds and E-mini Stock Index Futures (published by John Wiley and Sons).

Prior to joining the CME in 1988, Mr. Lerman traded futures and options on U.S. Treasury Bonds at the Chicago Board of Trade and was Senior Portfolio Manager at Zavanelli Portfolio Research. Mr. Lerman taught investment management at Harper College and has lectured at the Northwestern University Kellogg Graduate School of Management.