[[1]] methods were the fundamental cause of the shift from the primary to the secondary sector.

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New manufacturing methods were the fundamental cause of the shift from the primary to the secondary sector.
Together, all three sectors form a manufacturing chain for the economy. The primary sector gathers natural resources, then used by the secondary sector, and lastly sold by the tertiary sector to finance the other two sectors' operations. Due to the advent of new production techniques throughout the industrial revolution, the primary industry changed into the secondary sector. Many new methods of manufacturing were introduced. New ways of manufacturing steel, mass production, assembly lines, electrical grid systems, large-scale production of machine tools, and the employment of more sophisticated technology in steam-powered industries were only a few of these breakthroughs.

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