Final answer:
The claim that all open-air markets specialize in one type of goods is false; markets can have a variety of specializations based on geographic and economic factors, and can offer a diverse range of products.
Step-by-step explanation:
The statement that "All open-air markets specialize in one type of goods" is FALSE. Open-air markets, historically and in contemporary times, have not been limited to specializing in just one type of goods. In the context of economic history, open-air markets have been central to the development of market economies, particularly during the period known as the market revolution. This era saw a significant transition towards specialized goods produced by skilled artisans, allowing consumers to purchase higher quality goods rather than creating everything themselves. Furthermore, according to Von Thünen's model, proximity to market centers influenced the specialization of products based on their perishability and transport costs. However, this does not imply that markets specialized exclusively in one type of good. Instead, markets could have a variety of specializations depending on geographic and economic factors.