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Luxury wristwatches sit in the windows of a Cartier store, operated by Cie. Financiere Richemont SA, inside the Dubai Mall retail complex, operated by Emaar Malls Group, in the downtown district of Dubai, United Arab Emirates, on Friday, Nov. 6, 2015. Home prices in the emirate dropped 12 percent in the 12 months through June, the biggest decline among 56 residential markets tracked by broker Frank Knight LLP. Photographer: Jasper Juinen/Bloomberg via Getty Images

Luxury wristwatches sit in the windows of a Cartier store, operated by Cie. Financiere Richemont SA, inside the Dubai Mall retail complex, operated by Emaar Malls Group, in the downtown district of Dubai, United Arab Emirates, on Friday, Nov. 6, 2015. Home prices in the emirate dropped 12 percent in the 12 months through June, the biggest decline among 56 residential markets tracked by broker Frank Knight LLP. Photographer: Jasper Juinen/Bloomberg via Getty Images