Each coupon will reach its absolute limit (=0) based on the scheme of partitioning (a form of metabolism), where a merchant (house included) takes a requested deductible per some transaction.
Once vended, the house will automatically take its cut of one (1) available ¢ent🪙 every minute [60 seconds] (1 ¢ent @ 1 minute) to sustain ongoing partitioning. (see stewc tax, crypto compliance)