At a certain output level, the cost per unit incurred by a firm to manufacture a product was $80. Once the cumulative output doubled, the cost per unit reduced to $72. This effect of the greater output amount on the lower cost per unit may be attributed to all of the following factors EXCEPT:

Group of answer choices

The firm uses a different business model.

The firm is able to spread marketing costs over more units of production.

The firm is able to spread rental costs over more units of production.

Employees gain greater learning and experience at production.