PARIS — For athletes and audiences, these have been the Olympics when raucous crowds have roared once again following years of lockdown restrictions.

But outside the din of the stadiums, it’s impossible to ignore that Paris is relatively quiet.

The International Olympic Committee promises that hosting the Games “generates powerful economic benefits.” And Paris 2024 has vowed that tourism, hotel and catering sectors “will benefit first and foremost from the influx of visitors.”

This…