If anyone knows about the comparative advantage* you can easily understand why global trade or international trade happens. However, anyone doesn’t have to understand comparative advantage just think like this; we are unable to produce or make all products, goods or offer services within in a same place or country. We have to rely on someone to make for us.
Supply and demand for any given commodities are also triggered international trade.
Bangladesh and India historically both benefited by specializing and trading according to their comparative advantages. Bangladesh has plentiful ready-made garments and clothing factories that can make the cheapest and great quality textile and textile fibers, while India is able to manufacture the cheapest automobiles parts and accessories. Each country would eventually recognize these facts and stop attempting to make the product that was more costly to generate domestically in favor of engaging in trade. Thus the comparative advantage occurs that turns to global trade.
