Final answer:
In an aggregate production function given by Y = N, labor productivity is represented by the number of units of output per worker, which in this case is 1, since Y and N are equal.
Step-by-step explanation:
If the aggregate production function is given by Y = N, the labor productivity is represented by output per worker, which is found by dividing total output by total labor input. Since output (Y) is directly equal to the number of workers (N), labor productivity is simply Y/N.
In this scenario, because the output is identical to labor input (since Y = N), this implies that labor productivity is equal to 1, which means for each unit of labor, there is one unit of output. Therefore, the correct answer is D. 1.
It's essential to understand an aggregate production function as it provides insight into the engineering relationship between inputs such as labor (L), natural resources (NR), capital (K), technology (t), and entrepreneurship (E), and the output, which is generally GDP or GDP per capita.