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by more_original 4078 days ago
> 2. What happened in Germany in ~1975 that made them suddenly start working?

I think it may have been the oil crisis in 1973. During the crisis, industry did not have enough work for its workforce. Instead of mass-layoffs, they tried to shorten working hours and cut wages accordingly. I think in 1975 the situation had normalized again, so that working hours increased again.

So, rather than an increase in 1975, it's probably a decrease just before.