The vaccine rollout, stimulus bill and rising stock market have helped fuel the increase in fortunes. Before it’s here, it’s on the Bloomberg Terminal LEARN MORE This article is for subscribers only. Joe Biden’s election has done little to slow the inexorable surge of wealth among U.S. billionaires. In the president’s first 100 days in office, against a drumbeat of calls for the rich to pay more in taxes, the 100 wealthiest Americans added a combined $195 billion to their fortunes, according...