[Jtsummers]

Monopsony is correct in that case, meaning one buyer. The argument being that Imagination Technologies essentially had one buyer due to Apple's outsized demand for their component. When Apple left, their demand was substantially reduced with no one (or group) to pick up the slack. TSMC is in a better position, everyone is clamoring for their products (or really their services and production capabilities) so if Apple left they'd hurt a bit, but all the other buyers would be thrilled and TSMC would see a blip for maybe a quarter.