This person is not only from a business school, he teach kids the wrong stuff.
Around May 2016, he appeared on CNBC telling people that Amazon was worth $325. Why did he value Amazon at $1,000+ now? It's been less than 2 years.
I am a big Warren Buffett fan, and I know valuation is key. And I have stayed away from Amazon for so many years, and regret doing that. I didn't have an open mind back then.
I should have bought Amazon when I became a Prime member and it was selling at less than $200 at that time. But I was sucking my thumb until it hit $700+. Then I finally realize I was wrong.
I guess people need to take some accounting courses to see the real picture.
If you must value a company using GAAP (people like PE ratio), you need to find a company that doesn't have any marketable securities, lease obligations, never acquired or merge with another company before.