I was recently struck by a realization: The people I read books about are very rarely the people I would ever want to trade lives with. Why? The price of their success was not one I would be willing to pay.There is a price tag for anything you want to achieve in life. Every single thing you want is an output that requires certain inputs to buy or earn. There's a "list price" (actual, direct price to pay for the thing you want) and a "real price" (List Price, plus the hidden, indirect price in the form of the tradeoffs and opportunity cost of the pursuit).What I've learned: There are many things in life that look like a great deal based on the List Price, but a ripoff based on the Real Price.Questions to ask: What is the List Price of the thing you want? What is the Real Price of the thing you want? Are you willing to pay that Real Price?