Relationship bet quality and productivity under lean philosophy?

Relationship bet quality and productivity under lean philosophy?
Under the Lean Thinking angle of view, Quality and Productivity are the 2 sides of the same medal. They go hand-in-hand. They are allied, not enemies. They are not antithetic.
The lean philosophy targets at maximising both Quality and Productivity because it targets at maximising Value: Quality and Productivity are the 2 most essential ingredients of Value.
Under the Lean philosophy, improving the one at the expenses of the other would be "handicapped".