$ cat cards/host-city-posters-head-coach-poster-21/faq/completion-faq-26.md
What happens to the checklist completion percentage if I trade away a card?
card: Host City Posters Head Coach Poster-21 · category: completion
[Concise Summary]
Trading away your only copy of a card will decrement your collection count and reduce your overall completion percentage.
[Structured Data Grid]
| Inventory Threshold | ≥1 copy required |
| Percentage Impact | -0.15% per card lost |
| Checklist Status Flag | Dynamic state check |
| Recommendation | Only trade duplicates |
Detailed Investigation & Analysis
The companion tracker calculates completion based on active inventory status. If your inventory falls below 1 copy for code Poster-21, the slot is flagged as uncompleted. Keep a duplicate swap buffer to avoid progress regression.
Additional notes for collectors: Ensure checklist entries are verified before confirming trades. Standard trade ratios are calculated relative to card popularity.
[Album Context Specs]
| Card Code | Poster-21 |
| Official Name | Host City Posters Head Coach Poster-21 |
| Estimated Value | $4.51 USD |
| Album Section | Host City Posters |
| Completion Mode | Required Checklist Item |