Answer:
Because it restricted the amount of money in circulation.
Marco Polo is very well known for his travels on this silk road as well as his 24-year journey to Asia. Throughout this time he became very well acquainted with the people he encountered and became a confidant of Kublai Khan. Since Kublai Khan was the Khagan of the Mongol Empire this allowed Marco polo to fit in better.
It was the Founding Father Thomas Jefferson who included the idea of natural rights when he wrote the Declaration of Independence, since he wanted to make it clear why exactly the colonies were breaking ties with Britain.
