Ramy, you said the most expensive city is actually in an emerging economy? Yeah, that's right, Polly. That would be Luanda, the capital of Angola. And in case you are wondering where exactly that is, it's right here, on the Atlantic coast of Africa. And you might not expect the capital of an emerging economy to take the title, but turns out that in the past few years, Angola has actually become one of the fastest growing economies in the world. And that's thanks in part to its oil riches. This is the picture of an oil flare, just off the coast, the Angola coast, from a well there. And the country is a member of OPEC as well as one of Africa's biggest oil producers. And it's using that oil income, well, to fuel a postwar reconstruction boom. That's pulling in a lot of foreign workers, and that of course is driving up housing costs. Those foreigners also might demand food that needs to be imported again. We are talking at the higher costs there. Now another expensive city in an emerging economy is the capital of Chad, N'Djamena. And it's the third most expensive city in this year's Mercer survey. Also rounding out the top three, we have to go to South America. And that is Sao Paolo, Brazil. It evolved from number 21 last year to number 10 this year. And one another interesting theme, out of this year's Mercer survey, is that there has been a clear jump for Australia. It turns out the five of its major cities all voted higher, including Sydney and Melbourne. They moved up between 10 and 40 notches from last year.