If marginal revenue exceeds marginal cost it is favorable to enter a contract in case of no limitations (enough capacities).

If marginal revenue exceed marginal cost, it is always better to enter this contract than selling it for a price that covers full cost.

For marginal pricing decisions, usually the fixed cost will be ignored.

The marginal cost is the minimum price at which a business can offer a product or service for sale (on the short run) in case of no limitations (enough capacities).

Marginal cost include full cost.