I re-read the book Hooked by Nir Eyal and these are my notes.
1/ The key question that the book answers is: how to make habit-forming products. And its answer is a model that involves four stages: a) trigger; b) action; c) variable reward; d) investment
2/ Why should products be habit-forming? It’s because only those products that become part of someone’s daily life go on to become valuable. So, whether a product has habit formation potential is a leading indicator for whether the product will turn out to be valuable. ...