One word makes people billionaires

What's the one word that you think makes people millionaires and billionaires ? 

You may say , work , dream , believe , struggle , hustle , time , productivity , etc..

The word is : LEVERAGE !

The definition of leverage is : maximum productivity with minimum efforts.

And there are many forms for leverage , that millionaires and billionaires idolise , but if you make those 4 , you'll definitely do many level up to yourself and your business :

1.  Money Leverage, like when you want to buy some equipements to your firm or buy some property , pay 10% of the price and borrow the remaining from a bank or an investor, the. Pay the rest every month. That is called money Leverage. 
2. Marketing Leverage, for exemple You make a marketing video for your business and publish it online, so many people will see it when you're doing other things. That's called marketing Leverage.
3. People Leverage, when you hire someone to do a task you used to do it, but you need to some other tasks in that time , that's called people Leverage.
4. System Leverage, for exemple when you're using a system that helps you to send 1 email to millions of people at the same time, that's called system Leverage.