The details of the bipartisan infrastructure framework President Joe Biden endorsed on Thursday are still up in the air. But a reliance on public-private partnerships to fund the proposals could lead to more tolls on American roads. (Photo: Gary Hershorn via Getty Images)

When President Joe Biden held a celebratory press conference after agreeing to a new bipartisan infrastructure proposal on Thursday, he emphasized one of his administration’s victories in negotiations with Republicans: No one making less than $400,000 a year would face a tax increase.