Key Takeaways Your shipping volume is the single biggest factor in what discount UPS or FedEx will offer you. More volume means more leverage. Carriers measure volume as dollars spent, not packages shipped. A smaller number of expensive packages can carry more weight than a larger number of cheap ones. Most contracts use rolling averages, often 52 weeks, to track your volume. Drop below your tier, and your discount can fall automatically, even mid-contract. Volume isn’t just