‘A behaviour which has rewarding experience is likely to be repeated’ can be explained by?

Expectancy Theory proposes that people will choose how to behave depending on the outcomes they expect as a result of their behaviour. In other words, we decide what to do based on what we expect the outcome to be. At work, it might be that we work longer hours because we expect a pay rise. However, Expectancy Theory also suggests that the process by which we decide our behaviours is also influenced by how likely we perceive those rewards to be. In this instance, workers may be more likely to work harder if they had been promised a pay rise (and thus perceived that outcome as very likely) than if they had only assumed they might get one (and perceived the outcome as possible but not likely)