What a currency peg buys, and what it costs

What does it mean?

A currency pegTermCurrency peg×ربط العملةA fixed exchange rate between a local currency and another, usually the dollar, so the rate does not move with market supply and demand.Open the term is a price a central bankTermCentral bank×البنك المركزيThe government's bank, which controls the money supply, sets interest rates, and oversees all other banks in the country.Open the term promises to hold. It announces a rate against another currency, almost always the dollar, and then defends that rate by buying and selling foreign reserves whenever the market pushes against it. The Gulf states and Jordan run their currencies this way. Egypt does not: the pound floats, and its rate is whatever the market says it is that day.

Described like that, a peg sounds like an arrangement between banks, several steps removed from anyone’s salary. It is closer to a trade, and the reader is one of the parties to it without having signed anything.

The trade works like this. A country that fixes its exchange rateTermForeign exchange×الصرف الأجنبيThe market where one currency is traded for another, at a rate that changes constantly based on supply and demand.Open the term and lets money cross its borders freely has given up setting its own interest rateTermInterest rate×سعر الفائدةThe percentage of principal charged by a lender or paid by a saver, usually stated as an annual rate.Open the term. It cannot hold both. If local rates drifted away from the rates paid on the currency it is pegged to, money would move toward whichever side paid more, and holding the announced rate against that flow is the one thing a peg cannot do indefinitely. So the local rate follows. A country that wants to set its own interest rate has to let the exchange rate move instead.

None of that is concealed. It is simply that the two halves of the trade show up in different places in a reader’s life, often years apart, and are almost never put next to each other.

Why should I care?

Because what a peg buys is visible every month, and what it costs is invisible until the month it is not.

What it buys is price stability, and that half is measurable. Saudi annual inflationTermInflation×التضخّمA general rise in prices over time, so one riyal today buys less than it did a year ago.Open the term ran between 1.5% and 3.1% every year from 2021 to 2025, a spread of less than two percentage points across five years. Compounded, Saudi consumer prices rose about 12% over that period. Egyptian prices rose about 126% across the same five years, with a single year, 2024, at 33.3%. A saver in the Gulf planning around next year’s costs is working from a figure that has barely moved. A saver in Egypt doing the same thing is estimating, and the estimate has been wrong in both directions inside one decade.

That stability is not a matter of one economy being run more carefully than another. It is the peg doing the single job it exists to do, and doing it by importing the price level of the currency on the other side of the promise.

What it costs is the interest rate, and the bill arrives with no local explanation attached. Under a peg, the decision that changes a saver’s deposit rate and a borrower’s monthly payment is taken by the central bank of the currency being pegged to. When the Federal Reserve moves, Gulf rates move with it, whether or not anything in the local economy called for it. A saver in Riyadh or Dubai watching the local news for a signal about their savings account is watching the wrong country.

Egypt shows the other half of the same trade. The Central Bank of Egypt genuinely does set its own rate, and it has set high ones. The average deposit rate in Egypt in 2024 was 19.2%. Inflation that year was 33.3%, which left a real return of negative 10.6%. Local control of the interest rate is real, and it did not produce a positive outcome for the saver, because what the float gave up was the stability of the currency the rate is paid in. The number moved; the ruler moved further.

Put both regimes through the calculator above and the shape of the trade appears in a line each. A low rate against low inflation and a high rate against higher inflation are not two points on one scale. They are two arrangements, each of which solves the problem the other one has.

In Lebanon, the peg was the promise that broke. A fixed rate holds for as long as the central bank can keep supplying dollars into it, and that supply is finite. Since 2019, Lebanese depositors have found withdrawals restricted well beyond anything a published policyTermCar insurance×تأمين السياراتA contract that covers the cost of damage to your vehicle or injury to others, depending on the type of policy you hold.Open the term states, and daily pricing moved to the dollar. What that regime demonstrates is not that pegs are fragile in general. It is that the stability a peg provides rests on a balance sheet rather than on a law, and a household holding money inside one is exposed to that balance sheet without ever being shown it.

What should I know?

A peg fixes the exchange rate, not the prices. Imported inflation still arrives, in rent, in food, in anything shipped. The peg takes the currency out of the list of things that move prices and takes nothing else out of it.

Under a peg, the central bank worth following is the foreign one. The local institution administers a rate rather than choosing it, so a domestic announcement is usually the last step in a decision taken elsewhere. In a floating currency the reverse holds, and the local bank’s meeting is the event.

A high nominal rate is compensation, not generosity. Under a float, part of what a rate pays is the risk that the currency loses value while the money sits there, and that is precisely the risk a peg absorbs. Two rates quoted in percent, in two regimes, are describing different products.

A peg changes in one move or not at all. A floating currency loses value gradually and in public. A pegged one holds its announced rate right up until it is revalued or devalued, and then shifts the value of debts and savings in a single step. Gradual risk is easy to see and hard to forget. Step risk looks like no risk for years, which is what makes it easy to plan as though it were absent.

A peg is also a shelter, and saying so is not a recommendation. For anyone paid in a pegged currency, the exchange risk that dominates a floating-currency household simply is not there, and the questions that remain are the ordinary ones about rates, fees and job security. That is a real difference in what a person has to think about, and it is the direct benefit of the cost described above.

The arithmetic a saver does is identical in both regimes. Divide one plus the rate by one plus inflation over the same period, and subtract one. What changes between Cairo, Beirut and the Gulf is which of those two inputs is the one that moves, and therefore which one is worth checking more than once a year.

A monetary regime is not something a reader chooses, and for most people it never comes up. It nevertheless decides which of the two numbers on a bank statement, the balance and what the balance buys, can be trusted to stay where it was left.