Serfo, a 23-year-old Syrian Kurdish refugee from Aleppo, works in a barber shop in Istanbul, Turkey on Wednesday. Turkey’s 2.6 million Syrian refugees may be straining the housing and jobs systems, but they’re also fuelling economic growth. The world’s largest refugee population has had a positive impact on Turkish output, economists and government officials say. It may be partly responsible for an unexpected rise in third-quarter growth and stronger forecasts for 2016 output. SD-Agencies