Q.(a) Define 'Trade Surplus' and 'Trade Deficit'.

(a) Trade Surplus occurs when the value of a country’s exports of goods and services exceeds the value of its imports over a given period. In the National Income Identity for an open economy,

a trade surplus means net exports $(X - M) > 0$.

Trade Deficit is the opposite: imports exceed exports, so $(X - M) < 0$. A deficit implies the country is borrowing from abroad or running down its foreign reserves to finance the excess spending. …

(a) Trade Surplus and Trade Deficit

These two terms come directly from the Balance of Payments (BoP) accounts, specifically the current account. The current account records all transactions of goods and services (visible and invisible trade) and unilateral transfers. The difference between the value of a country's exports of goods and services and its imports of goods and services is called the Net Exports ($NX$) or the Trade Balance.

• Trade Surplus: This occurs when a country's exports exceed its imports over a given period (usually a year).

  $\text{Exports} > \text{Imports} \implies NX > 0$

  A surplus means the country is selling more to the rest of the world than it is buying. In the National Income identity ($Y = C + I + G + NX$), a trade surplus adds to aggregate demand and national income. It also implies that the country is a net lender to the rest of the world — it is accumulating foreign currency reserves or foreign assets.

• Trade Deficit: This occurs when a country's imports exceed its exports.

  $\text{Imports} > \text{Exports} \implies NX < 0$

  A deficit means the country is buying more from the rest of the world than it is selling. In the National Income identity, a trade deficit subtracts from aggregate demand. It also implies that the country is a net borrower from the rest of the world — it is financing the excess consumption/investment by selling domestic assets or drawing down reserves.

(b) Managed Floating System of Foreign Exchange Rate Determination

The managed floating exchange rate system (also called a dirty float) is a hybrid between a pure flexible (floating) exchange rate and a fixed (pegged) exchange rate. Under a pure floating system, the exchange rate is determined entirely by market forces of demand and supply of foreign currency — no central bank intervention. Under a fixed system, the central bank pegs the rate at a predetermined level and defends it using reserves.

In a managed float, the exchange rate is largely market-determined, but the central bank (RBI in India's case) intervenes occasionally in the foreign exchange market to influence the rate. The intervention is not to maintain a rigid target, but to:

1. Prevent excessive volatility: If the rupee depreciates or appreciates too sharply in a short period, it can destabilise trade flows, create uncertainty for businesses, and fuel speculative bubbles. The central bank buys or sells foreign currency to smooth out these sharp movements.

2. Guide the rate towards a desirable level: The central bank may have an implicit target zone or a desired range for the exchange rate (often linked to the real effective exchange rate, REER). If the market rate moves outside this comfort zone, the bank intervenes.

3. Manage reserves: The central bank may accumulate foreign exchange reserves during periods of surplus (to prevent excessive appreciation hurting exports) or sell reserves during deficits (to prevent a free-fall depreciation that could trigger inflation).

How it works in practice: …