Secular inflation in the United States since 1960 has been most likely be the result of persistent leftward shifts of the aggregate demand curve. persistent rightward shifts of the long-run aggregate supply curve. persistent leftward shifts of the long-run aggregate supply curve. persistent rightward shifts of the aggregate demand curve.

Persistent leftward shifts of the aggregate demand curve.

Explanation:

The inflation results in decreasing the aggregate demand. The real spending decreases the value of money. Secular inflation is prolonged period of slight price increase. This type of inflation continues to persist over a long time. The secular inflation in the United States has been due to leftward shift of aggregate demand curve.

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