If you try and compare your life to that of Louis XVI you might think that there's no comparison. The notorious French king had riches, servants and palaces, including that epic one at Versailles. Yet while Louis XVI was unbelievably rich, before his unfortunate appointment with the guillotine he lived in unsanitary conditions in a time of horrifically bad healthcare. Economist Grant Ryan hopes his new book and online graph-making tool can help people stop comparing their own lives to others with a method he calls Comaparonics.