The Chartbook

This is the chart to read first, because it sets the bar the rest have to clear. If a government will pay you a positive return above inflation for taking no credit risk and no liquidity risk, then a property has to pay you materially more than that to be worth owning — enough to cover the vacancy, the service charge, the agent, the tenant who leaves early, and the fact that you cannot sell half of it on a Tuesday.

When the real yield sat below zero, which it did for most of the decade after 2011, almost any income-producing asset cleared the bar and prices rose nearly everywhere at once. That was not skill. When it is positive, the bar is real, and a five percent gross yield that nets three has to argue for itself.

This is not the rate you will be quoted in Dubai or London, and it is not meant to be. It is here because it is the most closely watched mortgage price in the world and it moves on the same underlying government bond that everything else on this page moves on. When it rises, the monthly payment on the same house rises with it, and the buyer's budget falls even though the asking price has not moved.

For anyone buying in the UAE the link is more direct than it looks. The dirham is pegged to the dollar, so the central bank follows the Federal Reserve rather than local conditions. UAE mortgage pricing therefore takes its direction from US policy, which is a strange thing to accept until you notice it has held since 1997.

A negative reading means the bond market expects rates to be lower in a few years than they are now, which is usually another way of saying it expects something to break. It has preceded most US recessions, which is why it gets the attention it does.

Treat that record carefully. The lead time between an inversion and anything actually happening has ranged from months to well over two years, and it has been early enough to be useless as a trading signal more than once. It tells you what the market expects. It does not tell you when, and it has been wrong.

This is not a forecast published by an economist. It is the number at which people with money at risk are indifferent between the two bonds, which makes it the most honest inflation expectation available: everyone quoted in it has had to back it.

It matters for property because the whole inflation-hedge argument for owning real assets is that rents rise with prices. That argument is only as good as your ability to actually raise the rent, which in Dubai is governed by a decree with fixed tiers rather than by what the market will bear.

Put this next to the chart above it. One is what the market expected inflation to be; this is what it turned out to be. They are rarely the same, and the gap between them is the reason a portfolio built entirely on a forecast tends to disappoint.

One caveat worth carrying: a single national index describes an average basket in one country. It is not your cost of living, it is not Dubai's, and it is not the rate at which your rent, your school fees or your service charge went up.

If you hold dirhams, you hold dollars. The peg means this line is your currency, whether or not you ever think about it that way, and a strong dollar makes Dubai property more expensive for every buyer earning in sterling, euros, rupees or roubles without a single price changing.

The reverse is the risk most cross-border buyers ignore. Earn in one currency, buy in another, and you have taken a currency position the size of the property on top of the property itself. It is rarely deliberate and it is almost never hedged.

Oil is on this page because of what it funds rather than what it costs. Gulf government budgets, infrastructure programmes and the hiring that follows them still move with the oil price, and that flows through to population, to rental demand and eventually to property.

The link is weaker than people assume, though, and it is weakest exactly where they apply it hardest. Dubai's economy is far less oil-dependent than its neighbours': trade, logistics, tourism and financial services do most of the work. Treating the oil price as a Dubai property indicator is a habit inherited from the wrong emirate.