Answer: An inefficient firm is unable to achieve as much output as the production function shows.
Explanation:
The Production function shows the maximum amount of output that can be produced by a company given the a certain number of inputs which are usually capital and labor.
At each combination of the input therefore, the function shows how much a company should be able to produce. If a company is therefore inefficient and unable to use its inputs effectively, it will be unable to produce at the point it is to be producing at given the combination of inputs they are using.