How the rupee (USD-INR) affects Indian stocks

Reading the exchange rate

USD-INR is quoted as the number of rupees it takes to buy one US dollar. When the quote rises, say from 84 to 86, each dollar now costs more rupees, which means the rupee has weakened or depreciated. When the quote falls, the rupee has strengthened or appreciated. This catches many beginners out, because a higher USD-INR number is actually a weaker rupee, the opposite of the instinct that a bigger number is stronger.

The rupee's level is shaped by the gap between dollars coming in and dollars going out. India is a large importer of crude oil and electronics, which means a constant demand for dollars to pay for them. Against that sit exports, remittances from Indians abroad, and foreign investment flows into Indian stocks and bonds. When dollars flowing out exceed dollars coming in, the rupee tends to weaken, and the RBI sometimes steps in using its foreign-exchange reserves to smooth sharp moves, though it does not fix the rate.

The sector split a weak rupee creates

A weaker rupee is not uniformly good or bad for the market, it redistributes. Exporters win. An IT services firm or a pharma company that earns in dollars and reports in rupees sees its rupee revenue rise when the dollar strengthens, even if nothing changes in its business. This is why a sharp rupee fall often lifts the IT and pharma indices on the same day, and why these sectors are sometimes used as a currency hedge inside a portfolio.

Importers lose. Oil marketing companies, which buy crude in dollars, see their input costs jump when the rupee falls, squeezing margins unless they can pass the cost on. Companies that import components, like some electronics, capital-goods and auto firms, face the same pressure. Airlines, which pay for fuel and aircraft leases in dollars while earning in rupees, are classically hurt by a weak rupee. So the first thing a weakening rupee tells you is to rotate your attention toward dollar earners and away from dollar spenders.

The flows and inflation link

The rupee does not move in isolation from the rest of the macro picture. A weakening rupee often goes hand in hand with foreign investors selling Indian assets, because when they sell shares and take dollars home, they buy dollars and sell rupees, which itself pushes the rupee down. So a falling rupee and FII outflows tend to feed each other, and a stable or rising rupee is part of what keeps foreign money comfortable in India. This is why currency, flows and the index are watched together.

There is an inflation channel too. Because India imports so much oil, a weaker rupee makes that oil more expensive in rupee terms, which feeds into transport and production costs across the economy. This is imported inflation, and it can push the CPI higher, which in turn affects what the RBI does with rates. So a sustained rupee slide is not just an exporter-versus-importer story for the stock picker, it is a thread that runs through inflation and interest rates and therefore through the valuation of the whole market.

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