Can someone give me a brief idea how economy can change someone’s personality?

Wealth can cloud moral judgment
Another study suggested that merely thinking about money could lead to unethical behavior. Researchers from Harvard and the University of Utah found that study participants were more likely to lie or behave immorally after being exposed to money-related words.

Most of the findings point to money bringing out negative behavior in people. “The more money you have, the more focused on yourself you become, and less-sensitive to the welfare of people around you,”

In particular, if you're not careful, money may start to change your identity or sense of self. Having a lot of money can influence the way you think about yourself. It can change your sense of morality, and it can even have an impact on your relationships with other people