Dave I believe in this thread 'piece work' means that the employer pays the employees 'by the piece'.
I have no idea the real numbers used but for example at trim out.
$2.00 per receptacle, $0.25 per plate, $1.00 per high hat trim etc.
In this way the employee has an incentive install as many units as possible in a given time. A motivated worker could make a decent wage. The employer knows they will not be paying for non-productive time.
However if a piece worker runs across problems, say stripped threads on the box or device are they going to slow down and fix it right or just 'make it look done'.
Bob