My Econ professor was lecturing about supply and demand and was using her personal habit of buying 6-7 bottles of Dr. Pepper from the faculty lounge pop machine and that it cost $1.50 per bottle.
I asked her why didn’t she stop buying from the machine to see if they would lower the price as a result of the lowering the demand. Then I asked why she doesn’t she buy a case of it at Costco as that would be cheaper because of their high demand plus allow her to realize a savings which she could use on other products.
She was dumbfounded.
I forgot to mention that she was buying 6-7 bottles each day.