A measure of warehousing output volume (weight, number of units). Also, the total amount of units received, plus the total amount of units shipped divided by two.

Retailer vs Wholesaler vs Distributor vs Reseller – What’s the Difference?
Starting a new eCommerce business can feel like learning a new language. You’ll quickly encounter terms like retailer, wholesaler, distributor, and reseller. What do they all mean, and how do they differ? In simple terms, these labels describe different roles in the supply chain that gets products from the maker