Pricing products that must be used along with a main product, such as razor blades with a razor, is known as:

Explanation

* Captive-Product Pricing sets a low price for the main product and high margins on necessary companion supplies.
* Examples include ink cartridges for printers, gaming consoles and games, or razor blades and handles.
* Two-part pricing splits fees into a fixed fee plus a variable usage rate (common in services).