A more thorough explanation:

The aggregate theory of partnership is a legal concept that states that a partnership does not have a separate legal existence like a corporation. Instead, it is only the sum of the partners who make it up. This means that the partnership is not considered a separate entity from its owners.

For example, if two people decide to start a business together and form a partnership, the partnership is not considered a separate legal entity. Instead, the partnership is simply the two individuals working together to run the business. If the partnership were to be sued, the partners would be personally liable for any damages or debts incurred by the partnership.

Another example would be if a group of doctors decided to form a medical practice together. The partnership would not be considered a separate legal entity, but rather the group of doctors working together to provide medical services.

The aggregate theory of partnership is important to understand because it affects the way partnerships are taxed and how liability is determined. Partnerships are typically taxed as pass-through entities, meaning that the profits and losses of the partnership are passed through to the individual partners and taxed at their personal tax rates. Additionally, because the partnership is not considered a separate legal entity, the partners are personally liable for any debts or legal issues that arise.