Vroom's Preference-Expectancy Theory

Reward 

Minimum Required
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Basic Premise: People will work hard for rewards they value if they believe those rewards can be earned by working hard.

Motivational Plan: Find out what employees' value then issue that reward when they exceed your goal.

Vroom found that by the late 80s employees had become alienated and distrustful of employers who treated them like a commodity to be purchased at the lowest possible price.