MCC

Does anyone know how to get the MCC curve? I would have thought it’s the first derivative of WACC but that doesn’t look to be the case.

This diagram shows the relationship between the WACC and MCC but MCC is obviously not a first derivative.

http://i595.photobucket.com/albums/tt40/Atomic_Sheep/MCC.jpg

I think the 1st derivative looks like the second graph:

http://i595.photobucket.com/albums/tt40/Atomic_Sheep/MCC%202.jpg

WACC is green in the top graph.