How to think about value

Determing the worth of something is difficult enough... we usually let markets decide for us. But value? There are so many more factors than price and quality. Opportunity costs, time and energy, other people's influences and perspectives - it's a tricky endeavor, and one I've been sort of obsessed with lately. Whether it's a commodity, experience or life decision, deciding on what I value - and how to best do that - is something I really need to think through.