​If long run average costs are constant with respect to output,you have

A) ​Increasing returns to scale
B) Decreasing returns to scale
C) Constant returns to scale
D) ​None of the above

How do endorsements support a writer's credibility?

A) They are an indication of sincerity
B) They show that acknowledged experts view the writer as competent and trustworthy
C) They replace communication skills with action
D) They show the writer believes in their skills
E) They show an understanding of company image