Exchange rates move with the supply of and demand for money
An exchange rate is ultimately a price, so it moves with the balance between demand for a currency and the supply of it. When more people want dollars, the dollar costs more and KRW/USD rises; when demand for the won is stronger, the rate falls. The four forces below are the main background factors that push and pull on that supply and demand.
Interest rate gaps and the trade balance
Interest rate differences between countries change the direction of money. When one country's rates are relatively high, money tends to flow into that currency in search of higher interest. When US rates rise above Korea's, demand for dollars tends to increase, which pushes the exchange rate up.
The trade balance is also tied to currency demand. When exports exceed imports and dollars keep flowing into the country, demand to convert them into won pushes toward a stronger won; when imports dominate and dollars flow out, the pressure is toward a weaker won.
Risk appetite and the dollar's special status
When markets turn uneasy, investors move money out of risky assets into places seen as safe. The dollar is regarded as the leading safe-haven currency, so in a crisis demand for dollars surges and KRW/USD often rises. This is known as dollar strength in a risk-off phase.
Because the dollar holds a special status as the reference currency of world trade and finance, it responds not only to conditions inside the United States but also to fear and relief around the world. That is why KRW/USD can move on overseas events that seem to have nothing to do with Korea.
Forces outside the market: currency authorities and policy
If the four forces above are the market's supply and demand, each country's currency authorities (the central bank and the government) are another variable that moves exchange rates.
When the rate leans too far in one direction, the authorities may trade currency directly in the market to soften the swing, or signal in words that they are prepared to step in. The latter is called verbal intervention.
The authorities hold foreign exchange reserves as ammunition, so they can briefly slow a move that runs with market forces. But this manages the pace, not the direction. So policy and intervention are best read not as signals of the next exchange rate, but only as one part of the background for understanding why the rate moved as it did.
Reading the background without mistaking it for a forecast
These four forces often pull in opposite directions. If interest rates are pushing the rate up while the trade balance is pushing it down, the actual rate on a given day depends on which force was stronger that day. Knowing the background therefore does not make it possible to call the next exchange rate.
Jupick provides this background only as a reference for understanding why exchange rates moved as they did. Jupick does not forecast future exchange rates and gives no advice to trade any currency. This content is for information only and is not investment advice.