What happens to the marginal returns when additional units of labor are added to a fixed amount of capital?

When we add more workers to a fixed amount of capital, like machines or tools, we can see changes in how much extra output each worker can produce. At first, adding more workers often leads to higher production because they can work together and use the machines more effectively. However, after a certain point, adding more workers results in smaller increases in output. This is because the fixed amount of capital can become crowded, and workers may get in each other’s way or have to wait for machines. For example, if a bakery has one oven and adds more bakers, the first few bakers can work efficiently, but eventually, too many bakers will lead to delays and less extra bread being made.