Why does the trade balance and the current account balance track so closely together over time?

The trade balance is the difference between a country's exports and imports of goods and services. It's calculated as follows: Trade Balance = Exports - Imports A positive trade balance (surplus) indicates that the country exports more goods and services than it imports, while a negative trade balance (deficit) means the opposite.

The current account balance is a broader measure of a country's transactions with the rest of the world. It includes the trade balance (goods and services), net income (income from investments and wages) and net unilateral transfers (remittances, donations, etc.). The formula is: Current Account Balance = Trade Balance + Net Income + Net Unilateral Transfers

Since the trade balance is a component of the current account balance, any changes in the trade balance will directly affect the current account balance. However, the relationship between the two is determined by the magnitude of the net income and net unilateral transfers: if they are relatively small compared to the trade balance, changes in the trade balance will significantly impact the current account balance. Moreover, although trade balances and current account balances tend to track closely, they do not always mirror each other. This is because the net income and net unilateral transfers components can also vary significantly, potentially offsetting the impact of the trade balance.

Many factors, such as exchange rates, inflation, government policies, and global demand, affect both trade balance and current account balance. Therefore, these two measures tend to exhibit similar patterns over time as they react to similar economic factors.

The exchange rate influences the trade balance by affecting the prices of exported and imported goods. If a country's currency depreciates, its exports become cheaper, and its imports become more expensive, leading to an improvement in the trade balance (higher surplus or lower deficit). Such changes in the trade balance would subsequently influence the current account balance. In conclusion, the trade balance and the current account balance track so closely together over time because the trade balance is a significant component of the current account balance, and both measures respond to similar economic factors such as exchange rates, inflation, and global demand. Nonetheless, it's essential to consider the net income and net unilateral transfers when analyzing their relationship, as these components can sometimes offset the impact of trade balance on the current account balance.