How did specialization increase productivity in Adam Smith’s pin factory example?

In his seminal work, The Wealth of Nations, Adam Smith illustrated how the division of labour dramatically increases productivity by breaking a complex manufacturing process into simple, repetitive tasks.12

In his pin factory example, Smith noted that if a single worker attempted to perform every step of pin-making—such as drawing the wire, straightening it, cutting it, pointing it, and grinding the top—they could likely produce no more than one pin per day. By contrast, when the process was divided into approximately 18 distinct operations performed by specialized workers, the factory could produce thousands of pins daily.12

This increase in productivity occurs because specialization:
* Eliminates transition time: Workers do not lose time switching between different tools or tasks.3
* Simplifies tasks: By focusing on a single, repetitive motion, workers become more efficient at their specific function.3
* Enables scale: The rational organization of these processes allows for a significantly higher total output than individual craftsmanship could achieve.13

Smith identified this specialization as a primary engine for economic growth, though he also observed that such extreme task simplification could lead to the intellectual degradation of the worker.2