The U.S. unemployment rate shot up faster than in any other developed country during the pandemic. WSJ explains how differences in government aid and labor-market structures can help predict how and where jobs might recover. Video/illustration: Jaden Urbi/WSJ The number of applications for unemployment benefits has held steady in September at just under 900,000 a week, as employer uncertainty about the economic recovery six months into the coronavirus pandemic continued to restrain hiring gains. Jobless claims increased slightly to 870,000 last week from 866,000 a week earlier, according to Thursday’s Labor Department report. The totals remain well above pre-pandemic peaks but are down significantly from nearly seven million in March. The…