As the once productive working population (Goods and Services, real value to people) leaves the work force, and many young folk who want the fast buck, Trading and social media etc which brings little value in real term ( You can't eat or drink a digital asset) the national debt grows. Look at the chart of work force participation and the national debt overlayed. It's simple, too many new jobs don't bring real value to people, and the problem stems from the digital world being created and it's getting worse by the minute.