"Obviously, consideration of costs is key, including opportunity costs. Of course capital isn't free. It's easy to figure out your cost of borrowing, but theorists went bonkers on the cost of equity capital. They say that if you're generating a 100% return on capital, then you shouldn't invest in something that generates an 80% return on capital. It's crazy."

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We started in our living room on a card table in our living room, and we have a multi-million dollar company and we know it can be done without borrowing a dime. It takes a while to get it started and to turn the wheel over, but the next time it's easier and the next few hundred times, it's easier than that. Have a budget where you reinvest a percentage of every dollar you earn to grow it.

— Dave Ramsey