Consider what the job market looked like a century ago. There were relatively few jobs to choose from, and they included such things as medicine, teaching, the military, shopkeeping, or banking. There really wasn’t much chance to do a lot more than this, especially since technology was not as advanced as it is today. That breakthrough in technology and the innovations that have come from it since have meant that many new jobs have been created, even as some of the old ones have disappeared.