Understanding Business Cycles, Effective Demand, and Income Flow

Features of Business Cycles

Though different business cycles vary in duration and intensity, they share common features, which are explained below:

• Wave-like movement: A business cycle is a wave-like movement in macroeconomic activity, such as income, output, and employment, showing upward and downward trends in the economy.
• Recurrent nature: Business cycles are recurrent and occur periodically, though they do not follow a strict regularity.
• Distinct phases: They consist of distinct phases: prosperity, recession, depression, and recovery.
• Variable duration: The duration of business cycles may vary from a minimum of two years to a maximum of ten to twelve years.
• Synchronic character: Business cycles are synchronic; they are all-embracing rather than affecting a single industry. Contraction or expansion spreads through the economy like a chain reaction.
• Types of cycles: Cycles can be minor (three to four years) or major (four to eight years). Despite timing differences, they follow a common sequential pattern.
• Cumulative effect: Expansion and contraction phases have a cumulative effect.
• Broad fluctuations: Fluctuations occur not only in production but also in employment, investment, consumption, interest rates, and price levels.
• Asymmetric speed: The downswing is typically more sudden than the upswing.
• Profit volatility: Profits fluctuate more than any other type of income, creating uncertainty and making economic forecasting difficult.
• International scope: Business cycles are international in character, spreading between countries through trade relations.

Phases of Business Cycles

Business cycles exhibit four distinct phases, which are useful for understanding their fundamental causes:

1. Prosperity (Expansion, Boom, or Upswing)
2. Recession (Upper turning point)
3. Depression (Contraction or Downswing)
4. Revival or Recovery (Lower turning point)

The cycle starts from a trough (lowest level of economic activity), passes through recovery and prosperity, reaches a peak, and then enters recession and depression until it hits the next trough. No phase has a definite time period, and no two cycles are identical.

1. Prosperity

Prosperity is a stage where money income, consumption, production, and employment are high or rising, with no idle resources. It is characterized by high capital investment, bank credit expansion, high prices, high profits, and overall business optimism.

2. Recession

Recession is the upper turning point and a phase of slowing economic activity. It is generally of short duration. During this phase, profits, investment, and share prices fall significantly, leading to reduced demand for bank credit, lower interest rates, and decreased employment.

3. Depression

Depression is a period where economic activity is far below normal. Money income, consumption, production, and employment fall, while idle resources and unemployment increase.

4. Recovery

Recovery follows depression. Various exogenous and endogenous factors revive the economy, causing economic activity to gather momentum in terms of income, output, employment, and investment, though growth remains below the steady path.

The Principle of Effective Demand

The principle of effective demand is central to Keynes's theory of employment. It manifests in total spending on consumption and investment goods. Unemployment results from a lack of effective demand. It depends on two factors: the Aggregate Demand Function and the Aggregate Supply Function.

Aggregate Demand Function

The aggregate demand price is the total sum of money entrepreneurs expect to receive from the sale of output at a particular level of employment. The aggregate demand curve slopes upward from left to right, meaning that as employment and income increase, the aggregate demand price also increases, albeit at a diminishing rate.

DIAGRAM

Aggregate Supply Function

The aggregate supply price is the minimum amount of proceeds required to induce entrepreneurs to provide a given amount of employment. If sellers do not receive these minimum receipts, they will reduce output and employment. The curve shows the cost of producing a certain level of output.

DIAGRAM

Equilibrium Level of Employment

The intersection of the aggregate demand function and the aggregate supply function determines the level of income and employment. At equilibrium, expected sales proceeds equal the total costs incurred by entrepreneurs.

Circular Flow of Income

The circular flow of money refers to the process where money payments and receipts flow in a circular manner continuously. Components include savings, investment, taxation, loans, government purchases, exports, and imports. In a modern monetary economy, transactions generate two flows:

1. Product or real flow: The flow of goods and services.
2. Money flow: The flow of money payments.

These flows move in opposite directions. Economists use simplified models to explain this, dividing the economy into four sectors: Household, Business (Firms), Government, and Foreign sectors.

The Money Market and the LM Curve

The LM curve shows combinations of interest rates and incomes corresponding to equilibrium in the money market. According to Keynes, liquidity preference is the sum of transaction and speculative demand for money. The total money demand function is Md = L(Y, r), where Y is real income and r is the interest rate.

DIAGRAM

The Slope of the LM Curve

The LM curve is upward sloping. At higher income levels, higher interest rates are required to maintain money market equilibrium with a constant money supply. If money demand is highly responsive to income changes or less responsive to interest rate changes, the LM curve will be steeper.