I was thinking the same thing. Aggressive negotiation with suppliers is a feature of monopsonies.
Edit: I've thought about it some more. There are parallels but important differences.
The main one is products. Apple design the products themselves, have a very limited product range, and are more intimately involved in manufacturing than Walmart is.
Walmart has a much more complex supply chain problem. Thousands of products, with a changing mix based on seasons and perishability, taken from far more sources and distributed to far more locations.
For the ones (such as me) who went "mono-what?", a monopsony is the situation where one unique buyer buys from different sellers. It's the opposite of a monopoly, where an unique seller sells to different buyers.
Edit: I've thought about it some more. There are parallels but important differences.
The main one is products. Apple design the products themselves, have a very limited product range, and are more intimately involved in manufacturing than Walmart is.
Walmart has a much more complex supply chain problem. Thousands of products, with a changing mix based on seasons and perishability, taken from far more sources and distributed to far more locations.