Sustainability fits the bill: the other answers are related, but don't quite nail it.

Pre-contracting a supplier, the term 'supplier appraisal' is favoured by CIPS; whereas once the sup-plier is in use, 'vendor rating' is the preferred term for monitoring actual performance.

The triple bottom line is the correct answer.
Three bottom lines instead of the traditional single 'bottom line' - profit.

The correct answer is 'The Earth'.
In other words, we should stop plundering the Earth's resources carelessly.

Cube.
Indicating that people, unless made consciously aware, tend to under-use the dimension of height, using depth and breadth readily. For illustrations, check aerial photographs of many US cities (sprawl), or check the inside of your fridge. In warehousing and storage, such an approach can be a very costly error - so 'maximise use of the cube'.