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.

WILLIAM ACKMAN:

William Ackman is founder and CEO of Pershing Square Capital Management. Formed in 2003, the hedge-fund has acquired significant shares in companies such as JC Penney, General Growth Properties, Fortune Bands and Kraft Foods. Ackman advocates strategies of "activist investing," the practice of using stock shares in publicly-traded companies to influence management practices in a way that benefits shareholder interests.

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