The correct equilibrium conditions are:

• (A) Aggregate demand = Aggregate supply: Correct. This is the most fundamental condition. It means that the total amount of goods and services that consumers, businesses, and the government want to buy is equal to the total amount that producers are willing to supply. When this holds, there is no unplanned accumulation or depletion of inventories, and firms have no incentive to change their production levels.

• (B) Savings = Investment: Correct. This condition is derived from the aggregate demand and aggregate supply equality in a simplified model (e.g., a two-sector model without government or foreign trade). In such a model, Aggregate Supply (Y) can be represented as Consumption (C) + Savings (S), and Aggregate Demand (AD) as Consumption (C) + Investment (I). Therefore, if Y = AD, then C + S = C + I, which simplifies to S = I. In a more complete model with government and foreign trade, this expands to Leakages = Injections (S + T + M = I + G + X, where T is taxes, M is imports, G is government spending, and X is exports). However, "Savings = Investment" is a core representation of equilibrium.

  (C) Consumption = Government Expenditure is not a general equilibrium condition in the Keynesian model. Consumption is just one component of aggregate demand, and it does not necessarily have to equal government expenditure for the economy to be in equilibrium.
• (D) Planned Expenditure = Planned Output: Correct. This is essentially another way of stating that aggregate demand equals aggregate supply. "Planned Expenditure" refers to the total spending that households, firms, and the government plan to undertake. "Planned Output" refers to the total production that firms plan to produce. Equilibrium occurs when these plans are consistent, meaning there are no unintended changes in inventories.