Robotic manufacturing is expensive, but delivers high levels of precision, exacting tolerances, better fitting parts.
When you make millions of them then the cost comes down per unit. It becomes cost effective to have millions invested in an assembly line, not only for the car assembly but the engine/transmission units.
Look at handblown xmas ornaments, basically a glass ball with pretty colors, they cost $30 and a lot more. Compared to light bulbs that were a buck each.
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