[jacquesm]

You'd be surprised at the 'normal' margins for many kinds of businesses. In IT we have it super easy.

[SyneRyder]

Someone on Twitter posted an excerpt about profit margins from the Southwest Airlines CEO's book. Looks like it was about 7.5%. Or as the book puts it, the lost of just one customer per flight reduces their profit on that flight by 20%:

https://twitter.com/morganhousel/status/856493737308037121

[elcapitan]

If you want to look up margins by industry, Aswath Damodaran's valuation resources are a good start: http://pages.stern.nyu.edu/~adamodar/New_Home_Page/datafile/...

[kalleboo]

And people wonder why airlines overbook...

[golergka]

Risks though.