Example #1 Anchoring
Zara sale 50% off
If you tell someone a jean normally costs $29.99 they will instinctively think they have found a bargain when they see it advertised somewhere for 14.49. Likewise, they will assume the item is overpriced if they see it on sale somewhere else for $34.99. The first price acts as an anchor, influencing people’s interpretation of the prices they come across in the future.
we compare different offers against one another and we make decisions based on comparative values.

Example #2 Reactance
Nazis propaganda against Jews
The Nazi propaganda machine exploited ordinary Germans by encouraging them to be co-producers of a false reality. Jews were either portrayed as seedy, degenerate, ugly, masses associated with vermin, or they were portrayed as greedy, fat, and unpleasant elements who sided with the enemy. Hitler created the idea that freedom and the Germany economy had been lost because of Jews. I also create feelings of hatred and aggression against them and that it was necessary to take extermination measures to restore a new Germany. Nazis used propaganda to define the enemy (Jews), and they sought to elicit one or more cognitive biases to archive their goal.