Some places face heavy oversupply, others look unaffordable, while in most prices are sliding.

World sugar prices hit their lowest in a decade late last year amid heavy oversupply.

But the global market still faces a heavy oversupply and oil stockpiles are near record highs in many parts of the world.

Heavy oversupply in the property market, an important sector of Dubai's economy, has seen residential prices slide by at least a quarter since mid-2014.