Ms. Truss has been cheered on by conservative champions of supply-side economics in the United States, including many of the chief backers of Mr. Trump’s tax cuts. Stephen Moore, who served as an outside economic adviser to the former president, praised Ms. Truss for her willingness “to challenge the reigning orthodoxy by sharply cutting taxes to boost growth,” calling the package “a gutsy and sound policy decision.”“By far the most important change is the reduction in the top income tax rate from 45 percent to 40 percent,” Mr. Moore wrote. “This will bring jobs, capital and businesses back to the U.K.”A host of critics, though, have lined …
