When in macroeconomics an economy ‘overheats’ it is observed that aggregate demand exceeds national income at the full employment output level. Within a ‘Keynesian cross’ framework this overheating is described as which of the following: (a)  A Goldilocks effect; (b)  A hyperinflation; (c)  A recessionary gap; (d)  An inflationary gap Please illustrate the correct answer via a diagram.

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