Economists assume that most individuals act as if they are motivated by self-interest and respond in predictable ways to changing circumstances.
Assumption of rationality.
According to the Rationality theory, people are always motivated by self interest. This means that when people want to satisfy their want or interest , The can go at any length to achieving the things that will maximize utility.
This motivation by people is a factor for competition from producers in order to satisfy their consumers unlimited wants.
Learn more on the concept of rationality here: https://brainly.com/question/11095042
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