When labor productivity increases over time, generally A) it is due to increases in the number of workers b) so do average wages C) it results in higher prices for goods and services .

b) so do average wages

Explanation:

In perfect competition's equilibrium, productive factors are paid according to  their marginal productivity. This means that productive factors' payments will be directly explained by their productivity. This comes from the fact that a firm maximizes profits, subject to its budget constraint, in an optimal way. Equilibrium solution will result in the following condition: , where is the marginal productivity of labour and is the marginal product of capital, is the price of labour (or wages) and is the price of capital. Then, because the price of labour is proportional to its productivity, if labour productivity rises, the price of labour will increase.

Xd ik what you mean i was very behind last year in my classes. if u have trouble with math i suggest photomath.