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One of the reasons behind the significant increase in international trade is the advancements in technology. Over the past 50 years, progress in transportation, communication, and information technology has made it easier, faster, and more cost-effective for businesses to trade internationally. The containerization of cargo shipment has greatly reduced transport costs and increased efficiency, enabling businesses to move goods across borders more quickly and cheaply.

Changes in trade policies and agreements between countries have facilitated international trade. Over the years, several countries have lowered their trade barriers, such as tariffs and import quotas, enabling a freer flow of goods and services across borders. International organizations like the World Trade Organization (WTO) and regional trade agreements like the European Union (EU) and the North American Free Trade Agreement (NAFTA) have played an essential role in liberalizing trade and fostering cooperation between countries, leading to increased cross-border trading activities.

Globalization has led to an increasingly interconnected world, with countries becoming more interdependent for their economic growth. This interdependence has encouraged countries to specialize in producing goods and services they are most efficient at, fostering international trade. The growth of multinational corporations (MNCs) and global supply chains has played a significant role in increasing international trade by expanding their operations and sourcing raw materials, parts, and finished goods from different countries.

In the past 50 years, countries' economic growth, particularly in emerging economies such as China, India, and Brazil, has resulted in increased demand for goods, services, and raw materials from different parts of the world. This demand has driven the expansion of international trade, as countries trade more with each other to satisfy their domestic and industrial needs. Furthermore, increased incomes in these developing nations have led to a higher demand for imported goods and services, further contributing to the growth of international trade. In conclusion, the dramatic increase in international trade over the past 50 years can be attributed to multiple factors, including advancements in technology, changes in trade policies, globalization, and economic growth. These factors have played a critical role in shaping the current global economy and are expected to continue to impact international trade in the future.