The substitution of steel for wooden ploughs in agricultural production is an example of capital-augmenting technological progress.

Capital-augmenting technological progress refers to the use of technology that increases the productivity of capital inputs in the production process. In this case, the substitution of steel for wooden ploughs involves the use of a more efficient and durable material, which enhances the productivity and effectiveness of the ploughs in agricultural activities. This technological improvement increases the capital input (the ploughs) in the production process, leading to higher productivity and potentially higher agricultural output.