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Capital deepening refers to an increase in the amount of capital (resources used as inputs in production) per worker. This can happen when an economy invests more capital to raise the productivity of its workforce, such as providing more advanced machinery or better training programs. The result is an increase in the output produced per worker.

Diminishing returns is an economic concept that states that as more units of a variable input are added to a fixed input, the increase in the total output will eventually decrease. In other words, it suggests that adding more of a variable input to the production process will result in a reduction in the increase in output per unit of input.

It is reasonable to expect that capital deepening can lead to diminishing returns. As the amount of capital per worker increases, it is likely that the additional increases in output become smaller. This is due to the fact that capital deepening can cause increases in productivity only up to a certain point, after which additional capital investment may result in less significant gains. For example, a factory worker may be more productive with a better machine, but if the factory adds more and more machines, there comes a point where the worker cannot effectively operate multiple machines simultaneously, resulting in diminishing returns.

On the other hand, improvements in technology may not necessarily lead to diminishing returns. Technological advancements can increase efficiency, minimize waste, and reduce the input required to produce the same or greater output. In some cases, improvements in technology could result in increasing returns, as new technologies may enable an industry to utilize resources more effectively or open up new markets. For example, advancements in automation technology can allow a production process to produce more output with fewer workers, while still maintaining high levels of productivity. In conclusion, capital deepening can result in diminishing returns because additional increases in capital per worker may not lead to significant productivity gains beyond a certain point. However, improvements in technology do not necessarily result in diminishing returns, as they can increase efficiency and enable the production of greater output with fewer inputs. The effects of technology advancements on returns depend on the specific circumstances and the type of technology involved.