While there is a sunk cost fallacy, your sunk costs do determine future costs. If you've already sunk a thousand hours into penmanship so that it will only tak

While there is a sunk cost fallacy, your sunk costs do determine future costs. If you've already sunk a thousand hours into penmanship so that it will only take you another ten to learn a new style, it's a better investment than spending a hundred on learning to type proficiently.