I couldn't disagree more with this. From experience I can talk about building wealth, and I will not give you concrete data about quantities because you will have no way to check if I am telling the truth but according to my experience building wealth is a simple process, following a boring plan as follows:

1) Control income and expenses.
2) Spend less than you earn.
3) If you have consumer debt, get rid of it as fast as you can. And never get into consumer debt again.
4) Increase your income and get different sources of income.
5) Invest, invest, invest.

This is in line with the two most comprehensive studies on millionaires that have been done to date: The Millionaire Next Door and Everyday Millionaires.

You can invest by doing these things but only if everything goes well and you are prepared to spend 2/3 of your life. If I was living in the 1960s I would have done all of these things but nowadays you have to take into account that the liberal system puts you in debt to get rich. Debt is not something to be afraid of and when used correctly it can make you rich. We are living in a time of increasing inflation in the world and saving money may not be wise.

If you want to invest in this situation, the most sensible thing to do is to invest with debt or credit. However, you need to be careful when doing so. If you don't make the right moves, the debt or loan you take can also drag you into the depths of misery.