What was the process by which people became more proficient at earning a living by performing a single task?

The process by which people became more proficient at earning a living through a single task is known as specialization. This occurred as societies transitioned from subsistence farming to more complex economies, where individuals focused on specific trades or crafts. By honing their skills in a particular area, workers increased their efficiency and productivity, leading to greater outputs and economic growth. This specialization also facilitated trade, as individuals could exchange their specialized goods or services, further enhancing their livelihoods.