Bill Ackman is one of the top investors in the world, and he's said that he's aiming to have "one of the greatest investment track records of all time." As the CEO of Pershing Square Capital Management, the hedge fund he founded, he oversees $19 billion in assets.

But before he became one of the elite, he learned the basics of investing in his early 20s.

This Big Think video is aimed at young professionals just starting out, as well as those who are more experienced but lack a financial background.

Ackman takes viewers through the founding of a lemonade stand to teach the basics, explaining how investors pay for equity, a word interchangeable with "stock." In the example, the owner starts with $750, with $250 of that coming from a loan.

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