Why does international trade require a system for exchanging currency between and among nations?

International trade necessitates a currency exchange system because different countries use different currencies, which can vary widely in value. To facilitate transactions, a standardized method of converting one currency to another is essential, ensuring that buyers and sellers can agree on prices and complete trades. This system helps mitigate risks associated with fluctuating exchange rates and maintains economic stability in the global marketplace. Ultimately, it enables smoother and more efficient trade between nations.