The manager of a spice grading unit argues that the unit should sell its graded chilli straight to retail shops instead of to the wholesale buyer, since the shops pay eighteen rupees a kilogram more than the wholesale buyer pays. Which of the following is an assumption on which the manager's argument depends?

Eighteen rupees is a gain in price, not a gain in money kept, and the two part company as soon as the new way of selling brings costs of its own. Should delivery and delayed payment eat more than eighteen rupees a kilogram, the unit is poorer for the change. The sacks are a detail; freedom from a contract is a practical condition of making the switch rather than a step in the argument; and the unit's standing among its neighbours is irrelevant either way.