They use computers and statistical analysis to construct mathematical models that enable them to determine how various economic systems work and to predict the effect of changes in the systems. Psychology Psychology involves investigation of mental processes and behavior. Physiological psychologists study how the nerves and the brain work. Behavioral psychologists observe and record the ways in which people and other animals relate to one another and to the environment. They use systematic methods to examine people's thoughts, feelings, and personality traits.
Psychologists also explore the causes of mental disorders and possible methods of treatment.
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