Final answer:
The text provided does not enumerate specific factors related to the success of joint ventures, but rather gives a broad economic context, discussing outsourcing, urban growth, intra-industry trade, and entrepreneurship.
Step-by-step explanation:
The factors that are NOT mentioned in the text as being essential for the success of joint ventures are a direct answer to the student's schoolwork question. Despite the provided excerpts referencing various economic factors and trade elements, specific factors contributing to the success or failure of joint ventures are not explicitly outlined.
Instead, a broader economic context is provided, discussing trends such as outsourcing, urban growth, intra-industry trade, and the role of entrepreneurship. It is important to note that while these topics give a broader understanding of economic principles, they do not directly address the success factors of joint ventures. Therefore, the text does not provide a definitive answer to the question about the non-essential factors for joint ventures' success.