The one issue every economist can agree is bad: Rent control
There aren’t that many things you can get economists to agree on. Fiscal stimulus, minimum wages, monetary policy, health care, bank regulation — on almost all the major issues of the day, you can find a respected economist to argue for either side.
But there are a few questions where there’s near unanimity, and rent control is one of them. Pretty much every economist agrees that rent controls are bad. And in the last decades of the 20th century, economists had some success persuading state and local governments to curb these policies.