The impact on the demand for hamburgers when Harris Teeter advertised a sale on Hamburger buns is an increase in the demand for hamburgers.
A sale is an activity where goods are sold at discounted prices. When a sale is advertised, people are most likely going to seize the opportunity to purchase goods at discounted amounts.
There will thus be an increase in the demand for goods.
So, the impact on the demand for hamburgers when Harris Teeter advertises a sale is an increase.
Learn more about advertising here:
https://brainly.com/question/5760297