Slot Machines at Caesar's Palace Lake Tahoe. Nik Wheeler/Getty Images hide caption
Technology changes. Giordano Poloni/Getty Images/Ikon Images hide caption
People line up outside a bank to exchange old currency notes with new ones on November 10, 2016 in New Delhi India. Shams Qari/Barcroft Media via Getty Images hide caption
Anil Bokil, a mechanical engineer by training, had a plan for demonetization. He presented it to now Prime Minister Narendra Modi in 2013. Chhavi Sachdev /NPR hide caption
Economists have a yearly job market that works a little bit like speed dating. Gary Waters/Getty Images/Ikon Images hide caption
Former Federal Reserve Chairman Ben Bernanke. Katie Kramer/NBCU Photo Bank via Getty Images hide caption
English economist John Maynard Keynes attends the United Nations International Monetary and Financial Conference at the Mount Washington Hotel in New Hampshire. Hulton Archive/Getty Images hide caption
Healy Hall, the flagship building of Georgetown University's main campus in Washington, DC. MLADEN ANTONOV/AFP/Getty Images hide caption
#NationalCaramelDay AJ Mast/Invision for Werther's Original via AP hide caption