Relative deprivation refers to the tendency for our personal happiness to be heavily influenced by

Other's attainments.

Explanation:

'Relative deprivation' is demonstrated as the theory that aims to describe the perceived insufficiency or lack of resources that are essential to maintain a standard quality of life as the people tend to decide the availability of resources relatively. Similarly, an individual's 'tendency for his/her personal happiness' is highly affected by 'other's attainments' in context of relative deprivation as people set their parameters of happiness relatively on the basis of other's possessions or attainments. People unnecessarily associate/relate themselves to people and feel 'deprived' and become sad.