But if you do not have it, you need a self-justification and that is what makes cognitive dissonance a powerful tools to changes someone’s belief, because if it is a personal choice, the changes are deeper and more durable.
2. Explanation and examples :
a. Justification of Effort :
If we put in more effort (money, work, etc.) at something we are going to cherish that thing more. This is related to cognitive dissonance where we want to justify something is better because we put more effort to it, even when the item is not necessarily good or better than the others (Even more so if we actually feel that it does not come up to par with the money / effort that we put to it, because we will experience dissonance and try to rationalize it.)
For example, people often say that an expensive wine taste better than cheap convenience store wine because people are spending much more money on the expensive one and even though the taste does not really change that much, they are going to rationalize the taste because of the thought of money poured into it and change their belief that it is indeed tastier than the convenience store wine.
b. Post-decision dissonance