What does it mean to be unemployable?

Brian Clark has been referring to himself as "unemployable" for many years now, and it's a common joke among entrepreneurs and freelancers. For Brian, he's not sure he's joking at all. Of course, the literal meaning of the word "unemployable" is no laughing matter. There are way too many people in the world who have been left behind without basic skills and opportunities for meaningful employment and the ability to earn a living wage....