Corporate is the only place I know that does perdormance based bonuses, and that was only for the Salon managers. If they stayed undè budget and the salon generated X amount in revenue they were paid 60% instead of 50%. Most mangers I knew cut lot's of corners and overworked their staff to make their numbers. Not all mind you. Small shops usually offered as previously mentioned incentives like a paid lunches or small tokens of appreciation. Most "bonuses" though were year end. Some were based on how many years you were with the company or what a weeks average pay would be.
Curious, do you feel you need to offer an incentive to increase productivity? Or just wanted to offer something to show employee appreciation?
It's not what you look at that matters; it's what you see.
Henry David Thoreau