What it means
The treasury market has a celebrity system: each maturity's newest issue becomes the on-the-run benchmark that everyone trades, and every older issue of similar maturity fades into the off-the-run crowd. The crowning happens at auction, so when a new ten-year note sells, yesterday's ten-year loses its status instantly and its trading volume migrates to the newcomer within days.
Liquidity is the whole difference, because benchmarks trade in enormous size at razor spreads while off-the-run issues trade thinner and wider, though both carry identical government credit. The New York Fed measures the phenomenon, and its research on measuring treasury market liquidity tracks how trading concentrates in the newest issues and how liquidity conditions differ across the curve.
The discount is the compensation, since off-the-run bonds yield slightly more than their on-the-run neighbours, a liquidity premium patient investors harvest by simply holding the quieter bond. Dealers intermediate the quiet, because selling a large off-the-run position takes a dealer's balance sheet and time, which is why the premium widens exactly when everyone wants to sell at once.
Relative-value desks live in the gap, as on-the-run versus off-the-run spreads are among the most traded relationships in finance, and leveraged funds betting on convergence caused famous rescues. Stress rewrites the hierarchy: in panics, only the benchmarks trade freely, the off-the-run premium balloons, and the quiet bonds become expensive exactly when their holders most want out.
The curve reads differently at the edges too, since traders fitting yield curves must decide whether to include the premium-laden older issues, and the choice changes every model built on top. Buy-and-hold flips the logic: for laddered portfolios never sold early, the premium is pure yield, and the demotion calendar becomes a shopping schedule rather than a risk.
For a business owner parking cash, the lesson is friendly, because buying slightly older issues at the auction cycle's edge picks up extra yield for risk that barely exists if you hold to maturity. For students of market structure, the pair is a natural experiment.
Identical credit, differing attention, and the spread between them isolates liquidity's price more cleanly than almost any other comparison in finance.
In practice
Real-world examples.
Example
A ten-year note's volume collapses within days of its successor's auction as trading migrates to the new benchmark. The calendar predicted the demotion, so dealers had already adjusted their quotes. The older note still pays the same coupon, but it now trades thinner and wider.
Example
A convergence fund loses heavily when stress widens the on/off-the-run spread instead of closing it. The fund had borrowed to hold the trade, so the wider spread forced it to post more collateral. The trade unwound publicly and showed how leverage turns a small spread into a large loss.
Example
A corporate treasurer buys off-the-run paper for a hold-to-maturity ladder, banking the premium. On a $5,000,000 ladder, a seven basis point premium adds about $3,500 a year. The ladder never sells early, so the thinner trading costs nothing.
Formula
Calculation
Liquidity premium = off-the-run yield - comparable on-the-run yield.
Worked example: a five-year off-the-run yielding 4.12% against the benchmark's 4.05% pays 4.12% - 4.05% = 0.07%, or seven basis points yearly, for accepting thinner trading. On $1,000,000 held, that is $1,000,000 x 0.0007 = $700 per year. On a $5,000,000 ladder, the same premium is 5 x $700 = $3,500 per year, which the holder keeps only if the bonds are held rather than sold into a stressed market.Case study
Seen in the real world.
In this illustrative fictional case, Bodil, treasurer of an insurance firm, reviews her ladder of treasury holdings. Her dealer shows that shifting proposed purchases from benchmarks to one-cycle-older issues adds six basis points across the book. The insurer holds to maturity anyway, and the quiet bonds pay for the analysis within the first quarter.
On an invented $50,000,000 book, six basis points is $50,000,000 x 0.0006 = $30,000 a year. Bodil still keeps a liquid reserve in benchmark issues for cash she might need at short notice, so the premium is earned only on money she is sure to leave alone. The firm and figures are fictional.
Watch out
Common mistakes.
- Reading the yield gap as credit difference, when both bonds are the same government, and the spread prices liquidity and attention, not default risk. One government backs both. Attention, not safety, differs.
- Assuming the premium is free money, when selling early into stress means crossing the widened spread, and the premium only accrues cleanly to holders. Holders harvest; sellers repay. Stress collects the premium back.
- Forgetting the cycle is predictable, when every new auction demotes the previous issue, and the demotion's price effect is a calendar event, not a surprise. Demotion is a calendar event. The cycle repeats monthly somewhere.
Questions
People also ask.
What are off-the-run treasuries?
Older government bond issues replaced as benchmarks by the newest on-the-run issue of that maturity. Same credit, thinner trading, and typically a small extra yield as compensation. Same credit, quieter market. The auction crowns and dethrones. Benchmarks rotate; credit never does.
Why do they yield more?
Liquidity. New York Fed research on treasury market liquidity shows trading concentrates in the newest issues, so investors demand a premium for holding the quieter ones. Attention migrates at every auction. The premium is measurable daily.
Who should hold them?
Patient holders. Investors buying to maturity harvest the premium cheaply, while frequent traders pay it back in wider spreads exactly when markets are stressed. The premium widens in stress. Sellers in stress fund the patient.
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