In haggling with potential new customers, what is the absolute minimum price the sales representatives can drop to, while still allowing the additional sales to increase the companies overall profit?
In order to increase profit by producing more units of C, each additional unit of C produced must earn contribution towards fixed overhead costs (which cannot be avoided in the short term). Hence Sales - Variable costs for C must be positive. Consequently, any selling price that exceeds the variable production costs will provide some contribution. The minimum selling price must therefore exceed the variable costs of £1.70 - The sales representatives have a good deal of leeway for bargaining based on the normal, long-run selling price of £8.00 per unit!

