Hi! I just joined a couple months ago and I still haven't figured out an exact way to determine if a trade is fair or not when looking at rarity/demand/species/date. I have heard a few different answers that kind of helped explain it, but never a clear answer that can be used for every trade. Plus I have heard different answers that contradict each other (Ex: one person says that 2 commons equals one uncommon and another person says that 3 commons equals one uncommon) Because I'm horrible at explaining what kind of answers I'm looking for, I will give a hypothetical answer. This answer will not be accurate, it just shows what kind of format I'm looking for. I'd also like multiple answers if possible, just so I can have a few different opinions. Thanks everyone for your help! It's time for me to figure out how to send a fair trade once and for all lol. Hopefully I won't have to explain how I'm not good with pet values when I send trades anymore haha. Have a wonderful day!
Hypothetical answer:
"When they have the same/similar date, 2 very commons add up to the value of 1 common, 2 commons add up to 1 uncommon, etc.
When looking at date, one common equals the value of an uncommon from the year before it. One uncommon equals the value of a rare from the year before it and so on.
When looking at species, a dog or cat would be worth two other species from the same date and rarity.
A pet that is in high demand will usually be worth two other pets of the same rarity, date and species"
Oh btw, don't bump this topic please! Submit your answers in the replies if you have them, but don't just type "bump." That's considered spam! I might bump it if I don't seem to be getting any answers though.

Edit: I also need help with the same kind of thing with items, so if you can, please help with items too!