Yes, this is correct.
Crucially, this is only the case if everything else stays equal: so if the quality of the product stays the same and if the income of the buyers doesn't decrease.
Then with a lower prize, more items will be purchased - and less if the prize increases.
The placebo effect is a procedure in which a patient is made to believe that a drug has a direct on the person. Therefore improving his/her symptoms from the said disease that he/she is experiencing. It is directly injecting or making a procedure using alternatives. The idea is that the patient would believe such measures were done and that they will be cured from their diseases. There are no video clips available on you questions but I hope this helps.
