forward and backward linkages

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At the same time, these developments
in industry illustrate the progression of the Finnish economy from the
resource- and investment-driven stages, to the knowledge-driven stage. The various
forward and backward linkages that these industries have created at various points
in time have been of key importance in this context. In this sense, one can identify the
origins of the Finnish knowledge economy in the forest-related industries more than
three decades before the breakthrough of the ICT industries in the mid-1990s.

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пожалуйста, объясните, о чем речь!