About 80 percent of U.S. currency is now printed in the $100 denomination. Surprised? Quartz reporter Matt Phillips explains how this came to be.

Across the world in China, American expats spent this morning watching election returns at an event hosted by the Shanghai chapter of the American Chamber of Commerce.

Last night's presidential debate about foreign policy covered a range of topics. As expected, the candidates touched on China and its high-profile relationship to the United States.

As the presidential race shifts towards foreign policy, the candidates trade jabs over China on outsourcing and currency manipulation.

Today police in Iran fought with money lenders and other protesters in front of the country's central bank. Inflation in Iran is running at a shocking clip: the Iranian Rial is down 25% against the dollar in just the past week.

Restoring the link between gold and the dollar could send ripples through global financial system.

The town of Espinal in Southwest Mexico uses its own currency, the tumin, as well as the peso. Some say this boosts the local economy.

While most experts are still calling a return to the drachma for Greece unlikely, private companies are scenario planning just in case.

Greece continues to struggle through a debt and banking crisis and rumors of a 'Grexit' abound. If the country does leave the euro, how will it roll out the drachma, and what are the costs?