I assumed it was a simple average of sell prices, and it seems like gifts don't impact it, but after noticing some trades not impact it I have some questions.
1. Is there a delay before MV updates after a sale?
2. Is it a moving average? This one I could test on my own but while I'm asking questions I might as well check
3. Are trades between puppets noted as such and not counted towards the average (presumably to avoid inflating the price of a card, although it could still be done with a trusted friend)? I tried out the bidding mechanics with some puppets yesterday to see if it did what I thought it would and the eventual sale has not changed the price of the card. Could it just wait a few hours to update?