Money & WorkMental model
Convert prices into hours of your life, not euros.
This mental tool comes from the bestseller 'Your Money or Your Life': divide your net income by all the hours your job really consumes, including commuting and recovery. On €1,800 net and 200 hours, that's €9 an hour. A €90 pair of sneakers then costs ten hours of work. The question changes: is this worth ten hours of my life?
Useful: Converting to hours makes impulse buys measurably expensive without feeling like deprivation.
Source: en.wikipedia.org