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Cities throughout France, Germany and Belgium decline in global rankings owing to heightened security threats.
A typical business trip in Washington DC costs 8% more than in Los Angeles and 26% less than in New York.
A typical business trip in London costs 32% more than in Brussels and 18% less than in Geneva.
Hong Kong falls from regional top spot last year to second place.
Average cost of a business trip to Singapore is eight per cent cheaper than in Hong Kong.
New York is the most expensive location in the Americas and the world for high-end rental accommodation.
London is the fourth most expensive in the world despite Brexit.
Rents fall in Singapore - now seventh most expensive in Asia.
Hong Kong remains the most expensive location in Asia for high-end rental accommodation.
UK cities fall dramatically in global rankings - Central London drops 57 places and out of top 100.