The construction sector was in the past and is now and will also be in the future an important part of the world economy. There is always a necessity to build new structures, to implement new techniques and materials or to renovate existing buildings. Like elsewhere there is also in Germany always an up and down in the building sector. The building sector means: Domestic buildings, infrastructure and industrial buildings. The changes in building investments depend on the Gross Domestic Product GDP. If the GDP is rising, the number of building investments is also rising. This is also effective the other way round. The following graph demonstrates this relationship.
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