- What is the typical single?
- The median fair value of the set's Near Mint English singles — the price in the middle, so one chase card can't drag it up. Fair value comes from real sales only; the marketplace's Market Price is shown on card pages but never counted.
- What does the index line show?
- Each week the set's cards are compared with the week before and the typical change is added to a line that starts near 100. Above 100 the set's cards sell for more than they did a year ago; the 90-day figure is that same line, read over the last quarter.
- How is popularity scored?
- Out of 100, against the rest of the game: how much the set's cards sell for, how many of them sell each week, how many cards it holds and how its index has moved. It ranks sets; it isn't a price.
