The medial meniscus and lateral meniscus are specialized structures within the knee. These crescent-shaped shock absorbers between the tibia and femur have an important role in the function and health of the knee.
Specialization of labor is a powerful force in an economy, benefiting small and large businesses alike. Workers produce more when they occupy specialized roles, so businesses can offer higher quality products at lower prices.
It wasn't that the specialization and division of labor increased productivity and efficiency, but that they created openings, opportunities, for improved technology (tools, jigs, etc.) that actually did make the labor more productive.