WASHINGTON—The prospects for another large COVID stimulus package have reignited fears for inflation, causing a deep division among economists. While some forecasters believe that the stimulus plan pushed by Democrats threatens future inflation, the others shrug off these concerns, saying inflation worries are overstated. Democratic economist Larry Summers in an op-ed in the Washington Post raised concerns about President Joe Biden’s $1.9 trillion relief plan. Summers, who served as treasury secretary under President Clinton and top economic adviser to President Obama, said that the ambitious plan would bring “some big risks.” “The Biden plan is a vital step forward, but we must make sure that it is enacted in a way that neither threatens future inflation and financial stability nor our ability to build back better through public investment,” he wrote. Biden introduced a $1.9 trillion rescue plan to combat the economic downturn caused by the pandemic and the lockdown …