How Exchange Rates Work
Why the rupee rises and falls against the dollar, and what moves it day to day.
An exchangeA regulated marketplace where shares are bought and sold. rate is simply the price of one currency in terms of another — e.g. how many rupees it takes to buy one US dollar. Like any price, it’s set by supply and demand, and understanding what drives it explains the rupee’s daily moves.
The core idea: *a currency’s exchangeA regulated marketplace where shares are bought and sold. rate reflects the supply of and demand for that currency — and the rupee weakens when more rupees are being sold (to buy dollars) than bought. What drives that demand/supply balance? Several forces: (1) Trade flows — India imports more than it exports (a trade deficit), and importers must sell rupees to buy dollars* (e.g. to pay for oilThe energy commodity that moves economies — and India imports most of it.), creating persistent downward pressure on the rupee. (2) Capital flows — when foreign investors pour money into India (FIIForeign and domestic institutional money moving the market. inflows), they buy rupees (strengthening it); when they pull out (often when the Fed hikes — recall the spillovers lesson), they sell rupees (weakening it). (3) Interest-rate differentials — higher Indian rates relative to the US attract capital (supporting the rupee); a narrowing gapA jump between one bar’s close and the next bar’s open. weakens it. **(4) InflationThe steady rise in prices that erodes money’s purchasing power.** — higher domestic inflationThe steady rise in prices that erodes money’s purchasing power. tends to weaken a currency over time (its purchasing power erodes faster). (5) The RBI — intervenes by buying/selling dollars from its forex reservesA country’s holdings of foreign currency and gold. to smooth excessive volatilityThe size of price swings — not their direction.. The structural reality for India: as a net importer (especially of oilThe energy commodity that moves economies — and India imports most of it.) and an emerging market reliant on foreign capital, the rupee has a long-term gentle depreciating tendency against the dollar, punctuated by sharper moves around global risk events. Reading the rupee means watching trade, capital flows, rate differentials and global risk sentiment — it’s a barometer of India’s economic relationship with the world.
- What it is — the price of one currency in another (₹ per $); set by supply and demand for the currency.
- Drivers — trade flows (import-heavy India pressures the rupee), capital flows (FIIForeign and domestic institutional money moving the market. in/out), rate differentials, inflationThe steady rise in prices that erodes money’s purchasing power., RBI intervention.
- Rupee tendency — a net importer + EM reliant on foreign capital → long-term gentle depreciation vs the dollar, with sharp moves around risk events.
- Read it as — a barometer of trade, capital flows, rate gaps and global risk sentiment.
ExampleOilThe energy commodity that moves economies — and India imports most of it. prices spike: India must buy more dollars to pay for imports, so importers sell rupees — the rupee weakens. Simultaneously the Fed hikes, FIIs pull money out and convert to dollars (more rupee selling) — adding pressure. The RBI sells some dollar reservesProfits kept in the business rather than paid out. to cushion the fall. Several forces — trade, capital flows, rate differentials — pushed the rupee the same way, illustrating the supply-demand balance in action.
Key takeawayAn exchangeA regulated marketplace where shares are bought and sold. rate is the price of one currency in another, set by supply and demand: the rupee weakens when more rupees are sold (for dollars) than bought. Drivers are trade flows (import-heavy India), capital flows (FIIForeign and domestic institutional money moving the market. in/out), rate differentials, inflationThe steady rise in prices that erodes money’s purchasing power., and RBI intervention. The rupee tends to gently depreciate long-term vs the dollar, with sharp moves around global risk.
FAQs
Why does the rupee tend to weaken against the dollar over time?
Structurally, India runs a trade deficit (imports, especially oil, exceed exports), creating steady demand for dollars (rupee selling); it typically has higher inflation than the US (eroding the rupee’s relative purchasing power); and as an emerging market it depends on foreign capital that can leave during global stress. Together these give the rupee a long-term gentle depreciating tendency, punctuated by sharper moves around global risk events.