Too young to have ample experience? He’s distilling the results of reading over a thousand books on various business topics into a book on what business is. You don’t need ample experience for that. You need the stamina to read, judge and summarise all those books and the good taste and writing ability to actually write it.

It’s like the process of a journalist writing a book on a topic they have only the vaguest idea about, there’s a lot of reading and at some stage hopefully some understanding slips in. Except Josh has a business degree and worked at Procter & Gamble so he actually knew what he was on about before he started writing.