Which of the following is not a factor in determining Package Service prices?

The factor that is not considered in determining Package Service prices is related to the type of letter. Package Service pricing typically depends on measurable characteristics of the package itself, such as weight, destination, and size, as these aspects directly affect the cost of handling and transporting the item.

Weight is a key factor, as heavier packages generally incur higher shipping costs due to the additional resources required for transit. The destination is also critical, as shipping costs can vary greatly depending on how far the package must travel and the specific shipping zone it falls into. Size is taken into account because larger packages may require specialized handling or space during transportation, also influencing the shipping cost.

In contrast, the type of letter does not play a role in package pricing. Package Service pricing structures are designed specifically for items that exceed certain dimensions and weight thresholds and do not apply to standard letter mailings. Instead, letters follow a different pricing structure often based on flat rates or specific class designs that are separate from package services.