The Big 4
Transport wages are far speeding past the rest of the economy, as a high consumer demand and a tight freight market . Drivers are becoming short supply and costing companies like yours more.
Remember there are different grades and classes of raw material. Plastic, metal and electronics can come in categories of Bad, Good, and Best.
Supply and Demand
When demand is up, companies buy more of the raw inputs and materials they need from suppliers to meet demand, An inflow of orders can drive the supplier prices up.
With the surge of robotics deployed in manufacturing at a speed of light pace we still need people. It takes people to operate the machines your machines, perform inspections, assemblies, and prepare these for shipping.