Answer:
Average costs to remain constant
Step-by-step explanation:
In economics, a look at the constant-cost industry reveals that total output can expanded without an increase in the individual firm's average total cost. This is because when input prices remain constant , the long-run supply curve in a constant-cost industry is perfectly elastic.
Also, since 15% increase in all inputs cause a 15% increase in output; such change shows that if input prices remain constant, average costs will remain constant too.