What is a bond? Bonds in plain language, and why their price moves

The quarterly pension statement arrived. On page two there's a small table: "equities", "government bonds", "corporate bonds", a percentage beside each. Your eye moves on. Bonds, fine. Something for finance people.

Then one day the paper says bond funds fell, and something doesn't add up. Weren't bonds supposed to be the safe part, the boring part, the part that doesn't move? Or maybe you heard the opposite: that it's a world of formulas, for people who work at banks. Both pictures lead to the same place: not asking.

Two wrong pictures, and a missing one

Part of you would rather not know: "It's complicated, someone manages it for us." That isn't laziness. A complicated term spares you questions whose answers you may not have the energy for, and that quiet has value. Another part wants to understand what's being held on your behalf. Not to manage it yourselves, just so a drop on the statement doesn't feel like something that happened behind your back.

"Safe" and "complicated" are two different mistakes with one source: nobody showed you the simple loan behind the word. The terms came first, duration, yield to maturity, corporate, and the explanation stayed outside. What was missing was the explanation, not you.

A bond is a loan

A bond is a loan you make. To the state, and it's a government bond; to a company, and it's a corporate bond. In return the borrower commits to pay interest on known dates and to repay the principal on a known date, the maturity date.

An invented example with round numbers, for illustration only: you lend a friend 1,000 ILS for ten years at 3%. Each year they pay you 30 ILS, and at the end of the decade they return the 1,000 ILS. That's the whole story. Everything else is detail on the same question: who you lent to, for how long, in what currency, and how likely they are to pay back.

The rate-price seesaw

Now suppose, in the same example, that a year later market rates rise and a new ten-year loan pays 5%. You want to sell your loan to someone else. Why would they pay 1,000 ILS for it, when the same money buys a new loan paying 50 ILS a year instead of 30? They'll pay less. The old loan's price falls until it's worth roughly as much to a buyer as a new one.

When market rates rise, an existing bond with a lower rate is worth less. When rates fall, it's worth more. That's the seesaw, and it often explains much of the movement you see in bond funds. Such a drop is a drop in what the market will pay today. Whoever holds to maturity, provided the borrower keeps its commitment, receives the payments the loan itself promised. Hence yield to maturity: the annual return you get if you buy at today's price, hold to the end, and every payment arrives. A bond fund, by contrast, holds many bonds and replaces them over time, with no single maturity date; for a fund, its duration is the number to check.

For context only, not as a forecast: according to the Bank of Israel, its policy rate is 3.25% and the prime rate 4.75% (September 2026); check the current figure on the Bank of Israel site.

Duration: how hard the seesaw swings

Duration (מח"מ in Israeli statements) measures, in years, the average time at which a bond's payments arrive, with each payment, the ongoing interest and the final repayment, weighted by what it's worth today. Since some of the money arrives along the way, duration is usually shorter than the time left to maturity. For a bond with no interest payments along the way, duration equals the time to maturity.

Why it matters: duration tells you how strongly the price reacts to a change in rates. A common rule of thumb, approximate only: the price moves by roughly the duration times the rate change, in the opposite direction. An invented example: with a duration of 6 years, a one-point rise in rates can cut the price by roughly 6%; with a duration of 2, by roughly 2%. The longer the duration, the higher the seesaw swings.

Linked or nominal, government or corporate

Two more features complete the picture.

CPI-linked and nominal shekel bonds

Aspect	CPI-linked	Nominal shekel
What happens to the principal	Adjusts with the consumer price index	A fixed shekel amount
When inflation runs higher than expected	Keeps purchasing power	The fixed amount is worth less
When inflation runs lower than expected	The linkage adds less	The fixed rate can turn out better
What to ask	What's the rate above the linkage?	What's the rate, and what inflation is expected?

CPI-linkedNominal shekel

CPI-linked

What happens to the principal

Adjusts with the consumer price index

When inflation runs higher than expected

Keeps purchasing power

When inflation runs lower than expected

The linkage adds less

What to ask

What's the rate above the linkage?

Inflation itself, and what it does to money, has a separate article.

Government versus corporate is a question of credit risk: what happens if the borrower doesn't pay. Lending to the state is generally considered lower credit risk than lending to a company. A company may struggle to pay, so it usually pays a higher rate. Rating agencies publish ratings that try to describe that risk, and a rating is an assessment, not a promise.

Four questions for any bond or bond fund

• Who is being lent to: the state or companies?
• What's the duration, meaning how strongly will the price react to rates?
• CPI-linked or nominal?
• What happens if the borrower doesn't pay, and what's the rating?

0 of 4 done

One sentence, and one number from your track

The goal is modest: explain in one sentence what a bond is, and know how much of your track holds them. No bond math, and no changing tracks because of what you found. What people describe after understanding the seesaw is that a drop in a bond fund stops surprising them; whether to change anything is your decision.

This is general information, not personal advice. Choosing a track, transferring, or withdrawing from a kupat gemel (קופת גמל, a provident fund) or keren hishtalmut (קרן השתלמות, a tax-advantaged savings fund) is pension advice under Israeli law when given to a specific person; this article explains how the instruments work, and a licensed pension adviser can look at your case.

The Capital Market Authority publishes each pension, provident and study-fund track's asset mix on Gemel-Net and Pension-Net. Look up your track there and see what share is in bonds, government and corporate. How tracks differ has its own article.

In AlphaHome: the pension page (/app/pension) gathers the accounts where your bonds are actually held, with balance, fees and a free-text track field. And in savings goals each goal carries a date, so "when do we need this money?" sits next to the amount.

When the fund falls, or the number won't turn up

"The bond fund fell, and we thought it was safe." Until now there was no reason to think about this money, and that was fine; the surprise is natural. Today: check the fund's duration and what rates did over the same period. Often the seesaw explains much of the move. What people in this spot describe is doing this check before selling or switching tracks; the decision is yours. Next time: write the duration beside each account, so a drop is expected rather than a shock.

"We couldn't find how much of the track is in bonds." The feeling that "this is too complicated" is understandable; it spares you another hour on a website. Today: search for the track on Gemel-Net or Pension-Net, and if the answer isn't clear, send one written question to the fund manager. Next time: add the bond share to your list of accounts once a year, on a fixed date.

Understanding what's held for you

Skip the term, and it startles you every time it moves. Know the loan behind it, and a drop prompts two questions: what happened to rates, and what's the duration. That isn't expertise. It's one sentence and one seesaw.

Next time "government bonds" appears on the statement, your eye won't slide past it. It'll stop at a number you know how to read.

This week: find the bond share of one of your tracks on Gemel-Net or Pension-Net, and write one sentence: "About X% of this money is lent to...", with the numbers from the site.