Which of the following events will increase long-run aggregate supply?

Under a system of barter

A) each individual trades output directly with another. B) only agricultural goods may be traded. C) goods may be traded for money, but money may not be traded for goods. D) currency is accepted for purchases, but personal checks are not.

If aggregate output is above its equilibrium level ________

A) there is an excess supply of goods B) actual output is below planned expenditure C) firms will tend to replenish their low inventories driving output up toward equilibrium D) all of the above E) none of the above