The Digital Companion

Where the printed chapters keep going

A book has a page budget. The companion does not. For chapters 2 to 12 we wrote an extended chapter with the evidence behind the frameworks, worked numbers, current sources, and the mistakes we keep seeing. Each one is reserved for readers of the printed book.

1

Scan the code

Every chapter from 2 to 12 ends with a QR code. Scanning it opens that chapter’s companion on this site.

2

Enter the Reader Key

The key is printed under each QR code and on the copyright page of your copy. Type it once; this browser remembers it for all eleven chapters.

3

Read, on any screen

The companions are typeset for phones and laptops alike, with a table of contents and full sources.

The chapters

Eleven companions

Lost your key? It is on the copyright page of the book. If you bought a used copy without one, write to us.