HONG KONG – Shein shares dropped roughly 10% in their Hong Kong stock market debut on Tuesday, a rocky start for the fast-fashion e-commerce giant after a prolonged wait to bring its shares to public investors. “Shein’s Hong Kong listing marks a new starting point,” Leigh Gui, Shein’s chief financial officer, said in brief remarks at the listing ceremony. Shein has built its global following on ultra-fast, low-cost fashion, shipping trend-driven clothing from China to Western shoppers in a matter of days. and the European Union has increased duties on low-value parcels from China, including Shein products. At the same time, higher logistics costs, driven in part by the war in Iran, have put additional pressure on the company’s low-price model and profitability.