Jeff Bezos started his company by shipping old books out of his garage. But today the founder, chairman, and CEO of Amazon.com is the wealthiest person in the world, with a net worth of approximately $118 billion.

Over the course of last year he managed to leapfrog over Bill Gates with his $90 billion. But a more notable feat may be that Bezos has experienced the biggest single-year increase (more than $40 billion) of any individual in the last 100 years.

Becoming the first ever centi-billionaire is not easy. You have to be skilled in a lot of areas, primarily in managing other people. Building a mega online retailer such as Amazon requires the help of many individuals and creating a company culture that fosters innovation and long term planning.

Related: Can Amazon Keep Driving Up Consumer ETFs?

Amazon.com (AMZN), which is also known as “the everything store,” currently employs over half a million workers around the world. It has outpaced both Alphabet (Google) and Microsoft. Amazon has been known to regularly burnout its employees.

A NYTimes article reported that new hires “are told to forget the poor habits they learned at previous jobs. When they “hit the wall” from the unrelenting pace, there is only one solution: ‘Climb the wall’.”

Amazon is “a company that strives to do really big, innovative, groundbreaking things, and those things aren’t easy,” says Susan Harker, Amazon’s top recruiter. “When you’re shooting for the moon, the nature of the work is really challenging. For some people it doesn’t work.”

Recently I was given the opportunity to work at Amazon. I was only employed for about one month and I found the experience positive for the most part. The turnover rate is certainly high. Most new employees who started at the location I worked in did not stay with the company for longer than a year.

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