Gladstone, Max. The Craft Sequence

Series notable in particular for its soulstuff economy. Some excerpts from a Reddit AMA on

Excerpt from the excerpts:
Mundanername: Most of the wealth we see in the novels comes from complex investment schemes. If creative action grows the soul does that mean some occupations in the world do not just pay the workers a salary but the very act of performing the job generates wealth for the workers? 
MG: Depends—most employment contracts are structured so that added value goes to the Concern. It’d be a very special (and possibly doomed) Concern that didn’t work this way.  
Mundanername: Do people actually spend themselves to death in this world? 
MG: Yep. Though “death” is a bit of a misnomer—most of the time what happens is people spend themselves into zombiehood, and end up shambling about at the mercy of their creditors (depending on the structure of the debt). If they accumulate enough soulstuff by the terms of their contract they can come back to life, but apperception’s broken, and the psychological damage lasts a long time. Crafty folk are “better” at expending their soul—they can straight up spend themselves to dust if they’re not careful.
See also a post by Max Gladstone about writing Last First Snow.