Final answer:
The decrease in world trade can lead to a decrease in production and the availability of goods and services, leading to a slowdown in economic growth. It can also result in increased unemployment.
Step-by-step explanation:
The decrease in world trade can have a significant impact on overall economic activity. When trade decreases, it can lead to a decrease in production and the availability of goods and services, which can result in a slowdown in economic growth. For example, during the Great Depression of the 1930s, many countries reduced foreign trade, leading to a collapse of global free trade and worsening the global economy. Additionally, a decrease in world trade can lead to an increase in unemployment, as businesses may struggle to sell their products internationally and may need to lay off workers.