You defined a sunk cost properly, but that's not the same as the "sunk cost fallacy". To abuse my original example some more, when you are hungry, the steak is

You defined a sunk cost properly, but that's not the same as the "sunk cost fallacy". To abuse my original example some more, when you are hungry, the steak is still a sunk cost, but it's obviously not a "fallacy" to eat it then. EDIT: Just realized what you are responding to. I'll edit my post. Thank you!