Final answer:
When a country's central bank increases the money supply, the price level rises, and the currency depreciates relative to other currencies in the world.
Step-by-step explanation:
When a country's central bank increases the money supply, the most likely consequence is that the price level will rise and the currency will depreciate relative to other currencies in the world. This happens because increasing the money supply leads to an increase in inflation, which raises prices. Additionally, a country's currency depreciates as the increase in money supply weakens its value compared to other currencies.