psa-9-to-psa-10-multipliers

name	psa-9-to-psa-10-multipliers
description	Use when valuing PSA 9 vs PSA 10 across categories. The multiplier is the most important card-pricing variable.

PSA 9 to PSA 10 Multipliers

PSA 10 multiplier varies 2× to 50× over PSA 9. Modern Pokemon is steepest (5-15×); vintage sports flatter (2-4×).

Multiplier by category

Category	PSA 10 vs PSA 9
Modern Pokemon	5-15×
Modern Magic	2-5×
Vintage Pokemon WOTC	8-20×
Modern sports rookies	3-8×
Vintage sports (pre-1980)	2-4×
Modern Bowman 1st	5-12×
Modern parallels /50	4-10×
1/1 cards	N/A (auction discovery)

Why multipliers vary

1. Collector base preference (Pokemon collectors prioritize perfect; vintage collectors more lenient)
2. Pop scarcity at 10 (lower pop = higher multiplier)
3. Liquidity at 9 (less liquid = compressed 9 price, wider multiplier)
4. Print quality (foil/chrome amplifies surface defects, fewer 10s)
5. Era expectations (modern requires perfect; vintage forgives)

Submission strategy

High-multiplier categories: submit only confident 10 candidates. Modern Pokemon, vintage Pokemon WOTC, Bowman 1st — careful pre-screen. Low-multiplier categories: submit borderline cards. Vintage sports (PSA 8 still strong), modern parallels (PSA 9 acceptable).

Where this fits in the X3 empire

Drives Crossover Arbitrage tool EV calculations.