Each time our currency appreciates/depreciates or markets face a liquidity problem, our respected finance minister makes a TV appearance and promptly blames it to currency speculation. An analogy to this syndrome can be found in home minister blaming every militant attack on “Foreign Hand”. Intrigued, I decided to engage my mental faculties to understand this phenomenon a bit more.
To understand the role of speculators, we must follow the mechanics of going short the domestic currency. Going short means that individuals sell a currency which they do not own. This is done in hope that they can buy it back at a later time at a cheaper price. In foreign exchange, the short sale is accomplished by selling the currency in a forward transaction. A forward foreign exchange transaction, has its value date further out on the settlement calendar than spot, the latter being a trade for nearly immediate settlement.
The forward sale of a currency involves paying a “lending fee” that is based on the spread between the interest rate of the currency being sold and the currency being bought. But this lending rate, rather than being explicitly stated is folded into the forward exchange rate. The amount by which the forward exchange rate diverges from the spot exchange rates, called the forward points, determines the cost of going short the currency. Herein lies the basic principle of currency trading: The higher the domestic interest rates, more expensive it is to maintain a short position in that currency.
This is why central banks may choose to hike its short-term interest rate to defend its currency in the face of market pressure. The idea is to try to muscle speculators out of the market by raising the cost of their going short but in doing so the bank must accept that it is damaging its own economy. Higher interest rates may lead to bankruptcies and higher rates of unemployment. That damage can be catastrophic, as has been evident in the history of emerging market nations where bank loans are typically based on floating interest rates. Needless to say, you would be seeing the finance minister a lot more on TV.