Graph

This diagram had a circle in the middle connecting several boxes by lines.

The center circle says:

SYSTEM MARKET
willingness-to-pay for the old system = b
willingness-to-pay for the new system = b'

The left middle box, titled A2, has a line that connects to box A1 and the circle in the center.

The left middle box says
A2
cost = a

The left top box, titled A1, has a line connecting to box A2, the center circle and box B2.

The left top box says:
A1
cost = c

The right top box, titled C1, has a line connecting to box B2 and the center circle.

The right top box says:
C1
cost = c+d

The right middle box, titled B2, has a line connecting to box C1, box A1and the center circle.

The right middle box says:
B2
cost = a

The right bottom box, titled A2', has a line connecting to box A1' and the center circle.

The right bottom box says:
A2'
cost = a'

The left bottom box, titled A1', has a line connecting to box A2' and the center circle.

The left bottom box says:
A1'
cost = c'

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