Salary incentivizes the employer milking every last hour from the worker. Hourly incentivizes the worker to work slower. Project-based incentivizes the worker

Salary incentivizes the employer milking every last hour from the worker. Hourly incentivizes the worker to work slower. Project-based incentivizes the worker to cut corners and get things done as fast as possible. It seems like the optimal setup is some mix of these: retainer plus low hourly plus bonus on project completion.