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In 2009 Marcus Lemonis didn't have enough cash saved. He promised to never let that happen again

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Talking money with Marcus Lemonis

Whether you're saving money or spending it, star of CNBC's "The Profit" and serial entrepreneur Marcus Lemonis has the same advice for you: Know your numbers.

"You have to understand what your needs are and what you can actually afford," Lemonis told CNBC.

The self-made millionaire sets rules for himself. He doesn't like racking up debt, and he ensures a portion of his paychecks goes to savings.

"When the 2008/2009 downturn happened, I didn't have enough cash saved, and I promised myself that I would always be prepared for potentially a recession again," he said.

Those money rules helped him achieve his long-term goal of buying a house. He said closing on his house was the most exciting thing he's done.

Lemonis is famous for his People/Process/Product principle, where he analyzes businesses on the quality of people, excellence and relevance of product, and the best way to deliver the product.

Tune into "The Profit " on Tuesdays at 10 p.m. Eastern.

Disclosure: NBCUniversal and Comcast Ventures are investors in Acorns.