Balance of trade (BOT) is an important economic indicator for measuring a country’s foreign trade activity. It measures the difference between the value of a country’s exports and imports of physical goods and services. A trade surplus exists when exports are greater than imports, while a trade deficit exists when it is the other way round.

A favourable balance of trade indicates that a country’s exports and services are selling more in foreign markets than what it is buying from them. This translates into economic gains, as it leads to more foreign-currency inflows than outflows and helps increase foreign-currency reserves. These reserves, in turn, can be used to fund major investment projects, pay off foreign-debt obligations, and even prop up key industries or sectors that have been affected due to the changing global economic scenario.

On the other hand, an unfavourable balance of trade means that imports are higher than the value of the exports. Imports usually comprise of consumer items, machinery and equipment, raw materials and capital goods. A large number of imports can result in an overvaluation of the country's own currency, as an increase in the number of imports results in increased demand of foreign currency, thus causing its value to depreciate against the own currency. As a result, exports become less competitive in the global market and can lead to a sluggishness in economic activity.

In addition to BOT, it’s important to look at other economic factors while gauging the health of an economy. For instance, economic growth, inflation, consumer-spending trends, business cycles, and the availability of resources are all important indicators of economic performance.

Overall, the balance of trade is an important economic indicator to measure a country’s economic health. It is important to keep track of domestic and international supply and demand, investment flows, resources, consumer-spending trends, trade barriers, and overall economic cycles in order to properly assess the health of a country’s economy.