Opportunity Cost. Anytime there is a purchase, use of time, etc. I try to imagine what else I could do with that resource. Usually this is measured in cheese

Opportunity Cost. Anytime there is a purchase, use of time, etc. I try to imagine what else I could do with that resource. Usually this is measured in cheeseburgers or beer or months of server colo costs, time spent on Skyrim quests, etc. It's been very effective at forcing me to look at stuff I'm marginally interested in vs. focusing on things that I really want.