The sliding wage scale consists in increasing the wages as the prices rise in order to maintain the purchasing power of the workers even if there is inflation.
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In France
The sliding wage scale was introduced in France in July 1952 under the president Vincent Auriol (SFIO) in the administration Antoine Pinay (RI).
It was removed in 1982 as Jacques Delors (PS) was Finance minister, in the second administration of Pierre Mauroy (PS).
In Italy
In Italy it was introduced in 1975, modified in 1982 and definitely removed in 1992.
References
Sliding wage scale Wikipedia(Text) CC BY-SA