The vast majority of factory workers are not salaried, last I checked.
However, even salaried workers in the US are nominally required to be compensated for extra hours. It's not quite as straightforward, but you can't simply expect 60 hours per week from every salaried worker--that will likely land you in trouble with the Feds.
The main difference is that "exempt" workers generally don't care to avail themselves of various enforcement options. They just leave and get a different job.
However, even salaried workers in the US are nominally required to be compensated for extra hours. It's not quite as straightforward, but you can't simply expect 60 hours per week from every salaried worker--that will likely land you in trouble with the Feds.
The main difference is that "exempt" workers generally don't care to avail themselves of various enforcement options. They just leave and get a different job.