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do you mean the change of currency of europe into a single currency euro...
I mean the introduction of the new currency, the Deutschmark to replace the Reichsmark.
The day prior to Stalin implementing the Berlin Blockade, the Deutschmark was introduced into West Germany, which caused the East German economy to all but collapse due to the total worthlessness of the Reichsmark as a currency following the fall of Nazi Germany. The Blockade was a retaliatory measure.
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It was a western decision only, without negociation with the soviet Leaders. But Stalin needed any motive to try to evict western troops from West Berlin. Could have been another one, he would have made the Blokade anyway.