Card Trivia:Spell Economics
- "Fatal Abacus" appears in this card's artwork.
- This book appears in the artworks of "Fruits of Kozaky's Studies" (paired with "Fatal Abacus") and "Good Goblin Housekeeping".
- This card's name is a reference to this card's artwork, as the book features the economic symbols, "$" and "¥" in the design of its cover.
- In "Kozaky's" storyline, it is revealed that this book has an infinite number of pages, and the pen moves in accordance to the user's thoughts.