Short-run equilibrium output

Correct answer: B. Employment level and output in the economy

Explanation: Macroeconomic employment theory studies the level of employment and unemployment in the economy and explains their relationship with national income, aggregate demand and output. It is concerned with total employment conditions, not the identity of one employee, one firm’s advertisement or an individual worker’s clothing.

Correct answer: A. The equilibrium level of income and output

Explanation: When planned aggregate expenditure equals the value of total output, firms have no unintended accumulation or depletion of inventories, assuming the relevant model conditions hold. This equality identifies the equilibrium level at which planned spending supports the corresponding output and income. It is a central idea in short-run income determination. Therefore, option A is correct.

Correct answer: A. Equilibrium between aggregate demand and aggregate supply

Explanation: Equilibrium income is the level of national income at which planned aggregate expenditure, or aggregate demand, equals the value of aggregate output or supply. At this point, producers have no reason to change production because inventories remain stable. Thus, equilibrium income is a macroeconomic concept connected with aggregate demand and aggregate supply, so option A is correct.

Correct answer: B. National income determination

Explanation: In a macroeconomic model, total expenditure on consumption, investment, government purchases, and net exports influences the level of aggregate output and income. Equilibrium income is reached when planned aggregate expenditure equals output. Thus, the expenditure–income relationship is central to explaining how national income is determined.

Correct answer: D. How will equilibrium between aggregate demand and aggregate output be formed?

Explanation: In the Keynesian short-run framework, equilibrium national income is determined where planned aggregate expenditure or aggregate demand equals aggregate output. If demand exceeds output, firms may expand production; if demand is deficient, inventories rise and production may be reduced. Thus the central question is how aggregate demand and output reach equilibrium, making D correct.