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Friday July 3, 2009 - 11:22:16 GMT -

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A Forex Trader’s Tale of Central Bank Intervention

I have been trading the forex market for over 30 years and have seen central banks intervene in all sorts of ways. In the wake of the recent global financial and economic crises, governments are taking a more active role in managing their economies. This may or may not involve a more active role in managing their currencies although some (e.g. Switzerland) have taken a stand to discourage currency appreciation. The following is written from memory and is an anecdotal history of forex interventions.

My first introduction to intervention was in 1977, soon after Japan allowed the JPY to trade internationally. I was running a bank dealing room in Singapore and would open a line to our Tokyo office to monitor that market (there were no screens in those days and forex trades were conducted by telex, telephone and voice broker). USD/JPY was trading around 310 at the time and the Bank of Japan (BOJ) would come into the market and intervene at a price for $200,000,000. That was considered a large amount in those days and the BOJ would sit there until it bought its limit. It would then pull out and reappear 2 big figures lower. If it held off the market, there would be a scramble to cover short positions ahead of the Tokyo close. I remember one time when USD/JPY was trading at 305.99-306.01, the BOJ being on the bid at 306.00. We has sold USD/JPY and got a running account on the telex from our Tokyo dealing room – 15 minutes to the close, BOJ has bought 162 million… 10 minutes to go, BOJ has bought 169 million, finally with 1 minute left the telex rang out – change, 303.99-304.01. The BOJ got filled at 306 and now dropped its intervention level to 304. 


Floating foreign exchange rates was a new business and central banks have gotten more sophisticated in their approach over the years. In the 1970s-1980s, they were still finding their way. It was then I learned not to base trading decisions on expectations that a central bank would be there via intervention to bail out a position. Major US banks had a direct line to the Fed dealing desk and would get calls asking about the market and placing orders, usually to smooth the price action. In those days the dollar was under pressure so most of the orders were to buy dollars. It was the early 1980s and I co-managed a trading operation for a commodities company. I had close relationships with many bank dealers and got call one day from a friend who was furious. The Fed had been in the market during the US afternoon each day for months buying dollars to cool speculation. This day, the Fed seemed to disappear and USD/DEM dropped several big figures out of nowhere. Where was the Fed? My friend, apparently caught the wrong way by the disappearing Fed, went ballistic and called to find out what happened. It turned out those manning the Fed trading desk went to lunch and forgot to leave the customary buy orders. I learned then never to count on a central bank top bail out a position.

The most noted intervention took place after the Plaza Accord, in September 1985, when the G7 got together in New York City and decided to band together to push down an overvalued dollar. The meeting was held in secret and sprung upon the market on a Sunday night. This set off a prolonged slide in the dollar. I remember getting the news, looking at my portable quote machine ay come, calling my broker and hitting the first usd/jpy bid I could find. The first reaction was one of those strange ones and the pair actually rebounded from the initial reaction. I got out too soon once it started down again and we have never seen that level again. With some hindsight, the clue to this intervention was the element of surprise and the fact that it was a coordinated effort.


It was less than two years later, in February 1987, that the G7 felt the need to put a halt to the dollar’s slide. This led to the Louvre Accord, where the G7 agreed to stabilize exchange rates. All I remember of this time was a skeptical market and how much harder it was to stop a falling currency.


I don’t remember the exact date but believe it was sometime in 1989 when European finance ministers met in Gleneagles Scotland over the weekend and announced they would support the falling dollar. I remember it well as we were short USD/DEM at 1.9850 in a market where it was a safe bet to be short dollars. This weekend turned out not to be a safe bet. The surprise announcement saw the dollar gap higher. The first price we saw was 2.0850, a 10 big figure move. We were sick but fortunately not overleveraged. We stayed up all night and managed to trade out of the position with a small loss. Had we held on until the end of the week, we would have made money as the market renewed its attack on the dollar once it became clear the U.S. was not part of the agreement. Nonetheless, I never want to go through that experience again and recognized the pain that can be inflicted by a surprise intervention attack regardless of whether the impact lasts.


In 1992, the GBP was forced out of the ERM (European Exchange Rate Mechanism), where currencies traded within upper and lower bands vs. one another. Member central banks were required to support their currencies at the lower end of the band and vice versa at the upper end. The alternative was a revaluation or devaluation or in the case of the UK, an exit from the ERM. This was a famous incident where speculators put sterling under attack and forced the UK to exit the ERM, which resulted in a near freefall in GBP. It is also an example of what could happen when intervention fails. In this regard, it seems the markets used to be more willing to attack central bank resolve than nowadays, where they seem more content to be led by central banks.  In the old days, intervention, especially if it was unilateral, was like waving a red flag in front of a charging bull.


I don’t remember the date but believe it was in the 1990s when the BOJ bought about USD/JPY 30 bln during the month of March ahead of the Japanese yearend yet the pair continued to plunge. In this case, the flows were so overwhelming that all the BOJ could do was supply liquidity to ease the impact. The purpose of the intervention was not to reverse the trend but to slow it as it was flow driven.


This brings us to the current market, where the Swiss National Bank (SNB) has taken a stand to prevent the CHF from appreciating. Its focus has been mainly on eur/chf, where 1.50 appears to be the line in the sand. This intervention, while unilateral, has been effective in keeping eur/chf above 1.50 as the central bank has taken various tactics to keep the market off guard. Intervention was initially broadcast by the SNB that it did not want to see its currency appreciate. The SNB initially came in with a surprise attack buying eur/chf in the open market. It did this on several occasions before switching tactics when it became too predictable. The more recent interventions were apparently done using the BIS (Bank For International Settlements) as a surrogate by placing orders with it. The BIS not only bought eur/chf and usd/chf, but did so at successively higher levels to inflict as much pain as possible. Once the SNB exited the market, eur/chf has backed off but is currently finding support just below 1.52, which provides a cushion to the 1.50 “line in the sand.”


There are some lessons to be learned here. It is generally easier for a central bank to counter currency appreciation than to stop a falling knife (i.e. weakening currency). In the current trading world, where speculators are less likely to take on a central bank, it is better to step back and let the dust settle before trying to fade an intervention led move. Intervention is also more likely to be employed during times of tame inflation or deflation (such as current times) as a weaker currency can be inflationary.


This brings up another central bank who appears to be defending the downside, the Bank of Japan (on instructions from the Ministry of Finance). This is often referred toas stealth intervention whereby intervention is carried out by surrogates (e.g. government pension funds, etc). The idea is to keep the market guessing, deflect any criticism from other countries, and to slow the appreciation of its currency. In the current environment, it appears that usd/jpy 95 is the current “line in the sand.” Unlike past times, when the focus was on export competitiveness to the United States, the current strategy appears to be focused on China. The goal is probably to keep usd/jpy in a range (e.g. 95-105) as long as China keeps usd/cny in a narrow range. This is likely to remain the case until China’s economy stabilizes so expect the stealth intervention to continue.


This sums about a brief anecdotal history of intervention in the forex market. While I am sure I missed many instances, the stories should give enough background to put the current and future interventions in perspective.

Jay Meisler

Jay Meisler is a co-founder of, the leading forex discussion site for more than a decade and where traders from around the globe come for the latest breaking news, flows, rumors and trading ideas =>



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