18. In the above figure, the inflationary gap when $AD_2$ is the aggregate demand curve equals
(A) the difference between 110 and 100.
(B) LAS minus SAS at a price level of 100.
(C) the difference between $18.5 trillion and $18.0 trillion.
(D) \(AD_{1}\).

Pizza

Pepsi

| Quantity | Marginal utility | Quantity | Marginal utility |
| --- | --- | --- | --- |
| 0 | 0 | 0 | 0 |
| 1 | 20 | 1 | 30 |
| 2 | 16 | 2 | 8 |
| 3 | 10 | 3 | 7 |

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