Is a purchase card request decided by its amount alone, at the micro-purchase threshold, whichever office asks?

Two simulated models answer every variant several times. Accuracy hides the flaw; shifts where nothing should change expose it.

• model-a always gives the correct answer.
• model-b approves purchases up to $12,000 instead of below $10,000, and escalates 40% of requests from field offices, whatever the amount.