but not a good one.
Once, a classmate off-handedly explained a decision he'd made with the rationale that he "knew what his time was worth." I was speechless. How did he know? And what was it worth? This guy was cranking away at a couple businesses halfway through undergrad. His older brother once described him as seeing the world in "green and white." Still, he knew something important then, and I suspect he's capitalized on that knowledge for a long time.
My guess is that 99% of us undervalue our time in dollar terms, mostly because we never do calculations like this one.