Is there a special name for situations where you have only one or very buyers AND sellers at the same time? Like a combination of monopoly and monopsony power? I wonder how prices are discovered in situations like these?
You are reading about it! If a deal is met, the supply and demand curves presumably intersect, and a price is discovered.
Of course, with extremely low volume of deals and extremely high complexity, the risk of miscalculation and loss for either party is high. Apple overpaying and their customers not willing to pay, or TSMC underpricing and not being able to cover their costs of production to deliver the goods qt the agreed upon specifications. This is also a loss for Apple, since having a functional TSMC is the ideal, not forcing them to go out of business.