In Digimon World, Punimon said "buy item after digivolving, something good will happen", what is it?

Digimon World for PlayStation (PSOne). At some point Punimon will explain that you can press Start at shops to see item description, and say "buy an item after digivolving, something good will happen".

What is this "something good" and how do I trigger it?


Solution 1:

You may (but not necessarly always) get a discount on your purchase