Disruptions in the Strait of Hormuz could push small and medium-sized businesses out of global supply chains, increasing economic concentration and weakening the resilience of international trade, the United Nations Conference on Trade and Development said on Tuesday. • Rising energy bills, freight rates, insurance premiums and financing constraints sparked by the U.S-Iran war place heavier burdens on small and medium-sized enterprises (SMEs) than on large firms, leaving them more vulnerable than large corporations that can diversify suppliers, markets and funding sources.