Final answer:
In the absence of a written agreement, partners typically divide income or loss equally due to default legal rules, but this can vary with local jurisdiction laws.
Step-by-step explanation:
When partners in a business have not agreed in writing on a method for allocating income or loss, default rules set by law apply. In many regions, this would mean that income and losses are divided equally among the partners, regardless of their individual contributions or investments. This is based on the principle of equal ownership, which is often the standard assumption in the absence of a written agreement. However, this can be subject to the specific laws of the jurisdiction in which the partnership operates. Partners should therefore ensure to have a written agreement to avoid such default allocations if they prefer a different arrangement.