the charge directly related to the variable costs of production, such as length of the press run. It is normally charged on a per thousand ("per M") basis.
A running charge is applied to your order whenever you customize your item with additional colors and/or features. This charge is meant to cover the material cost of running your item through the machines. For example, if you want an additional color imprinted on your item, the running charge would be the cost for the ink used.
The charge assigned to names dropped by the mailer. A mailer could drop names for several reasons: duplication within the files, mailing was decreased, etc.