Why are brown eggs are more expensive than white eggs?

After I wrote about this topic yesterday, my Economic teacher Chris advised me about how could I add more reasons for this topic.

I think the reason for the brown eggs are more expensive than the white eggs are because of that those people who raise them feed more food to the hens who lay brown eggs.
However, the reason is not only because of it but also that people may have some kind of perception that the price is already high, so these eggs might be better or something or at least better for me. So maybe this kind of perception also controls the price of eggs.