The value of your collections
Every night the value of your collection(s) are calculated. The value is determined based on all the cards in that collection. From those cards, the trend prices are used to calculate the total value.
A trend price is an average price that shows how the price of a product over a certain period of time. It gives an idea of the direction the price is moving upward (upward trend) or downward (downward trend). It's useful to estimate if something will become more expensive or cheaper long term.