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psy·chol·o·gy (sī-kŏl'ə-jē) Pronunciation Key
n. pl. psy·chol·o·gies
1. The science that deals with mental processes and behavior.
stop being a retard. economics is the study of consumption, how do people consume? well that depends on their behaviour, what is their behaviour, that depends on the psychological processes of people.
In economics you broadly generalize and say that people are rational beings etc. when you make basic models, then when you go in and actually utilize the models you take into account different behavourial patterns etc. that can be read out of an assumption or belief in how people think, or out of a large amount of statistical data. But no matter how you do things, it is impossible to make falsification and verification processes that live up to the demands of hard science, thus both of them are soft sciences or pseudo sciences (if we define science as hard science).