Much of the electronics supply chain in North America depends on ground shipping of parcels.
There's the occasional complaint that FedEx and UPS exert too much pricing control on the supply chain, which puts cost pressures on small to midsized electronics firms. Shipping prices tend to get raised every year, and they're hard to pass through. (See The FedEx-UPS Duopoly.)
Those cost increases are usually tied to technology improvements. But what does the cost of trucking look like? (Check out the impact of coffee!) Take a look: