In this article, the researchers looked at how trade agreements among countries influence their trading patterns. They checked trade data from various regional groups to see if trading within their group differs from trading with countries outside. The results showed that different regional groups have big differences in their trade habits. Some countries in these groups choose to trade more with countries outside their region rather than within. The researchers also noticed a change over time from trading lower-value products to higher-value ones. This suggests that a country's level of development might affect its trading choices.