As technology changes, so does the job market. Two centuries ago, most low skilled workers would have found work as farmhands, while a century ago they would have been employed in a factory. Today they are most likely to work in the service industry, whether in retail, food service, janitorial services or as personal care aides in a nursing home or hospital. As I have written before, these jobs are often important stepping stones to better ones, even if they do not offer a direct path to advancement. Low skilled jobs still teach workers how to follow instructions and become...