An argument for producing all or part of a product in-house is that results because it makes planning

Cost saving.

Explanation:

Cost saving is not a single action more than it is a strategy (or could also be a policy if it were a business). This strategy or set of actions are motivated by the objective of reducing costs of transactions. They are measures that are taken to reduce the amount of money being paid for certain goods or services.

answer; in stage 6; morality of individual principles and conscience;