Q. Explain Two-part tariff system?

With a two-part tariff system the buyer is charged:

• A transfer price equal to the seller's variable (marginal) cost for each unit sold and transferred by the seller.
• A fixed charge per period by seller irrespective of the amount of units sold and transferred. The fixed charge should cover the sellers fixed overhead, give an element of profit and the necessary motivation for the seller to supply.

This method is similar in nature to how you are charged for most of your domestic bills.