
It is worse where lead times are long, batch sizes are large, and tiers are many: that means industrial and capital-goods networks more than direct-to-consumer retail. In retail, two or three tiers separate the consumer from the factory and lead times are weeks. In industrial networks like automotive aftermarket or building materials, five or six tiers can separate the end user from the raw-materials supplier, with lead times running to months. The amplification compounds at each tier, so deep networks see ratios above 5 routinely.