Construct Builders Ltd works very closely with a supplier called Solid Timber Co on house-building...

Construct Builders Ltd works very closely with a supplier called Solid Timber Co on house-building projects. They have a very close working relationship, sharing investment, setting pricing levels, and looking at sharing resources. The two companies also work closely together to set strategic directionsand explore new markets for long-term growth. There is no formal contract in place between the two companies. Using the relationship spectrum, what relationship does this scenario best describe?