How does Figure 19.2 support the following statement: "Looking at how countries of different income at any point in time supply environmental quality (the environmental Kuznets curve) does not necessarily indicate how an individual country's environmental quality will change as that country's income rises."

Figure 19.2

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-MPK(K, L. E) -MPK(K, L, E) Kret Kr (a) (b) KA K(t, E) -K(t, E) tax(t)