Apart from these factors, hard work and long hours at full capacity among the population in the 1950s, 1960s and early 1970s and extra labor supplied by thousands of Gastarbeiter (" guest workers ") provided a vital base for the economic upturn.

Apart from these factors, hard work and long hours at full capacity among the population in the 1950s, 1960s and early 1970s and extra labour supplied by thousands of Gastarbeiter (" guest workers ", since the late 1950s ) provided a vital base for the sustainment of the economic upturn with additional workforce.

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