What a bond really is

You lend a neighbour £100. He writes on a scrap of paper: I’ll pay you £5 next summer, and your £100 back the summer after. You fold it into your wallet. That scrap is a bond. A bond is nothing more exotic than a loan you can hold in your hand — and, it turns out, sell to someone else.

In the last item you became a part-owner of a business. A bond makes you something different: a lender. The difference between owning and lending runs through everything that follows.

Lending, not owning

When a government or a company needs money — to build a road, to open a factory — one way to raise it is to borrow from the public. It sells bonds. You hand over money now; it promises to pay you fixed interest along the way and return your money on a set date.

The pieces have names worth knowing:

• The face value is the sum you’ll get back at the end — say £1,000.
• The coupon is the fixed interest it pays each year — say £50, which is 5% of the face value.
• The maturity is the date your £1,000 comes back.

So a £1,000 bond at a 5% coupon pays you £50 a year, every year, then hands back your £1,000. That’s the deal, fixed in advance.

Here’s the key difference from a share. A shareholder owns the business and shares its fortunes — big profits, big losses, no promises. A bondholder is simply owed money. You don’t get a slice of the profits when things boom. But you get your £50 whether the company has a roaring year or a dull one — and if the company runs into trouble, lenders are paid before owners. Less upside, more certainty. The calmer cousin.

The fact that confuses everyone: price moves opposite to rates

A bond’s coupon is fixed for life. But the bond itself can be sold to someone else before maturity — and its price on that second-hand market moves. The rule trips up nearly everyone the first time:

When interest rates rise, the price of bonds you already hold falls. When rates fall, their price rises.

It feels backwards. Walk through why, with numbers, and it clicks for good.

A worked example: your 5% bond when rates change

You own a bond: £1,000 face value, paying a £50 coupon — 5%.

Now suppose interest rates across the economy rise, and brand-new bonds are issued paying £70 a year — 7%. Put yourself in a buyer’s shoes. Why would anyone pay you £1,000 for a bond paying £50, when the same £1,000 buys a fresh bond paying £70? They wouldn’t.

So to sell yours, you must drop its price until that fixed £50 represents the new going rate. £50 is 7% of about £714. At a price of £714, your bond’s £50 coupon finally matches what new bonds offer. Your coupon never changed — £50 is still £50 — but the price fell from £1,000 to £714 to keep up with rates.

Now run it the other way. Rates fall, and new bonds pay only £30 (3%). Suddenly your £50-a-year bond is the belle of the ball. Buyers bid its price up — to around £1,667, where £50 is 3% — because your fixed payment now beats what’s on offer. Rates down, price up.

Same bond, same coupon, opposite price moves — driven entirely by what rates did. That is why a news line like “bond yields jumped today” means, in plain English, bond prices fell. Yield and price are two ends of the same seesaw. You’ll push that seesaw yourself in a moment.

The whole, not the coupon

Step back. A government bond is a promise made to millions of strangers at once — every pension fund, every saver, every bank holding the nation’s debt. When you own one, you are one of the lenders keeping a country or a company running, paid a little each year for the use of your money and the risk that you might not be paid back.

That web of lending is as much the machine as the web of ownership. Interest rates — the price of borrowing — quietly tug on every bond in it at the same time, which is why a single rate decision can move trillions in an afternoon. You’re inside that, too: the rate on your savings, your mortgage, the bond in your pension all answer to the same tide. Seeing that the calm, fixed bond still rides the rate seesaw is the first crack in the idea that anything in markets sits truly still. Next we name the thing that makes the stock ride wilder than the bond at all: risk.