Which of the following is not a common form of ownership?

In the context of common forms of ownership, the correct answer is identified as business to business. This term typically refers to transactions or relationships between businesses rather than a specific form of ownership. In contrast, a joint venture represents a collaboration between two or more parties to achieve a specific project or venture, making it a recognized ownership structure. Syndication involves pooling resources from multiple investors to acquire and manage assets collectively, such as real estate, thus constituting a form of ownership. Similarly, a pension fund, which is established to manage retirement savings for a group of individuals, also involves ownership in the assets it holds.

The distinction lies in the fact that business to business describes a transactional relationship rather than a structured ownership model, whereas the other options are defined ownership entities with specific legal and financial characteristics.