Show someone a price and you have not just made an offer. You have set a reference point that every later number will be measured against. The first figure does not describe the value of the thing. It manufactures the scale on which the thing will be judged.
This is why the menu lists a dish nobody buys at a price nobody pays. It is not there to sell. It is there to make the second-most-expensive option feel reasonable, which it only does because the first one moved the goalposts before you noticed there were any.
::interactive::
A discount is a confession about the first price. Someone decided what you would tolerate, then let you feel clever for paying less.
You cannot opt out of anchoring, but you can choose your own anchor before someone chooses it for you. Decide what a thing is worth to you in advance, in your own units, and the seller’s opening number becomes information instead of instruction.