Want workers to show up? Let them vote on bonuses. Want more output? Let managers pick.

A new study found that how companies give out employee bonuses changes what workers do. If workers vote on who gets a bonus, more people show up to work. If managers decide, workers produce more.

Companies usually want both higher attendance and better output from their workers. This study shows those goals might conflict depending on how rewards are given. It means firms must now pick which outcome they value more when designing bonus systems.