The answers can be changeable. People invest to make their own money. In my country people work in hard conditions for about $300 per a month and the cost of living is too high. People are sick of it but they have to do as well. I do investing for an additional income for now but in the future maybe after three or five years I want to live well.
Investing in my opinion is a way to find additional income for long-term needs that are planned with a specific purpose, to finance education, buying a house, retirement or other interests.
Investing generally aims to make a lot of money or get rich and also improve the economy, but it would be better to invest with the desired goal in the future so that the investment goes according to plan and reaches the desired target.