Barbell strategy

Picture a barbell: heavy weights at each end, a thin bar in between. A barbell bond portfolio looks the same — most of the money in short-duration bonds, most of the rest in long-duration bonds, and very little in the middle.

Why build it that way? Because the manager expects a big move in interest rates but cannot tell which way. A barbell has something that benefits in either case:

• If rates rise, the short bonds mature quickly and are reinvested at the higher yields.
• If rates fall, the long bonds gain in price, compensating for the lower yield on reinvesting the short end.

The workbook calls this a natural hedge protecting the portfolio's overall return.

The workbook's example allocation is 40% short-term, 40% long-term and 20% mid-term.

"Short", "mid" and "long" are relative and depend on the objective and market structure. As a practice — which the workbook says is also endorsed by SEBI when categorising fixed-income mutual funds — it classifies bonds by Macaulay duration:

The barbell sits among the workbook's interest-rate-driven active strategies, alongside directional calls on duration, floaters, maturity extension, roll down and buying convexity. Its counterpart is the bullet, where holdings are concentrated around a single maturity.

Portfolio duration = Σ (weight of bond i × duration of bond i)

A barbell and a bullet can have the same average duration and still behave differently when rates move sharply, because the barbell's cash flows are spread to the two extremes.

Illustrative figures. A PMS manages a ₹10 crore debt mandate. The RBI's next moves are genuinely uncertain — a large move either way is plausible.

Portfolio duration = 0.4 × 1.5 + 0.2 × 5 + 0.4 × 9 = 0.6 + 1.0 + 3.6 = 5.2 years

If rates rise sharply: the ₹4 crore of short paper matures within months and is rolled into higher yields; the long bonds lose value but the short end starts earning more almost immediately.

If rates fall sharply: the long G-Secs rise meaningfully in price, offsetting the lower reinvestment yield on the maturing short paper.

A bullet portfolio of ₹10 crore concentrated at about 5.2 years' duration has the same average duration, but nothing that matures soon enough to catch a rise and nothing long enough to gain much from a fall.

Chapter 19 (Fixed Income Portfolio Management Strategies), section 19.3.1, describes the barbell with the 40/40/20 split and the duration buckets above. A Chapter 19 sample question describes a manager who expects a large rate move of unknown direction and asks which options to evaluate — the barbell portfolio is one of them.

• Barbell = uncertainty about direction, not a view that rates will rise or fall. A view on direction calls for a directional call on duration instead.
• Heavy at both ends, light in the middle. The workbook's 40/40/20 has the 20% in the middle.
• The duration buckets are the workbook's figures — under 3 years short, 3 to 7 mid, over 7 long.
• The workbook's own sentence on zero coupon bonds in this section is garbled ("the sensitivity of zero-coupon bond is highest for the same maturity coupon paying bonds"). The intended point, stated clearly in Chapter 4, is that a zero is more rate-sensitive than a coupon bond of the same maturity.
• It is an active strategy — it needs rolling of the short end and monitoring — not a buy-and-hold one.