Index investing and DCA is the best that the majority of people can do to become more wealthy. But this only works if you have big enough income
I disagree. You can still do dca method even if you do not have that huge amount of income. The idea that you cannot invest unless you are wealthy is just wrong.
If you know how to manage your finances well and you are able to save some of your income to direct to great investments then surely it is possible. If you manage to invest even in small increments but regularly then you can see some profit already after quite some time. Though of yourself you have to be careful with your money.
The purpose of economics is to acquire more wealth by using less money. Economics gives an idea of how a person will use his money property and get a sufficient return from it. so everyone needs to have economic knowledge for money management. we waste a lot of money due to various reasons because we prefer to spend unnecessarily and because of this we lose opportunities to increase our wealth day by day. so of course we have to be very careful and save money by reducing wastage