Attempts to hold currency rates rigidly within tight ranges through European Monetary System intramarginal intervention can be counterproductive bringing funds into the stronger currency from the weaker at rates still considered fairly favourable the Bundesbank said. The movements thus sparked can actually promote the weaker tendency of a currency requiring still larger obligatory intervention when rates hit band limits it said in its 1986 annual report. The other danger was that money supply expansion could be caused in the stronger currency nation without its central bank being involved in the activity. For this reason currency levels should be allowed as much room for manoeuvre as possible inside the band limits when a currency is in a phase of weakness the Bundesbank said. In addition speculative positions are made more expensive to hold when interest differentials are increased. In the report the Bundesbank gave a rare glimpse of the extent of intramarginal and obligatory EMS intervention that has taken place since the foundation of the eight-currency system on March 13 1979. Obligatory intervention is that required by EMS central banks when a currency reaches its agreed limit against another participating unit. Intramarginal intervention is undertaken on agreement between central banks when speculative pressure moves a currency in an unwanted direction although it may not yet be near any allowed EMS limits. At the start of this year central banks were very actively selling marks and supporting weaker currencies primarily the French franc as speculative EMS pressure grew. But the announcement by the Bank of France that it was ceasing intramarginal intervention sent the franc straight to its then-permitted floor of 31.8850 marks per 100. Data in the Bundesbank report showed the EMS central banks bought a net total 29.9 billion marks after the April 6 1986 realignment until the selling petered out on July 7. But this was far outweighed by net purchases between July 8 1986 and the realignment on January 12 this year totalling 63.0 billion marks - 44.1 billion of which was intramarginal and 18.9 billion was obligatory intervention. The data showed that 17.4 billion marks of the total eventually filtered into the West German monetary system. Since the latest realignment central banks have bought 16.1 billion marks in intramarginal intervention the Bundesbank said without naming the banks involved. Only very high activity after the March 21 1983 realignment came close to matching moves up to last January. Then central banks bought a massive 61.6 billion marks in the period up to July 1985 mainly to stabilise the EMS as the dollar surged. This then turned into mark sales of a net 34.0 billion from July 11 1985 in the run-up to the April 1986 realignment.
EMS INTERVENTION SAID SOMETIMES COUNTERPRODUCTIVE