Background
The concept of propensity to consume emerges from the field of macroeconomics and seeks to elucidate how individuals allocate their disposable income between consumption and savings. Disposable income refers to the amount of money households have available for spending and saving after income taxes have been accounted for.
Historical Context
This concept draws heavily from the Keynesian tradition, specifically introduced and elaborated upon by John Maynard Keynes in his pivotal work “The General Theory of Employment, Interest and Money” published in 1936. Keynes argued that understanding consumers’ spending behavior is crucial for developing effective economic policies, especially during economic downturns.
Definitions and Concepts
Average Propensity to Consume (APC)
The average propensity to consume is defined as the proportion of total disposable income that individuals use for consumption. Mathematically, it is expressed as:
\[ APC = \frac{C}{Y_d} \]
where \( C \) represents total consumption and \( Y_d \) denotes total disposable income.
Marginal Propensity to Consume (MPC)
The marginal propensity to consume refers to the fraction of additional income that individuals are inclined to spend rather than save. This is calculated as:
\[ MPC = \frac{\Delta C}{\Delta Y_d} \]
where \( \Delta C \) is the change in consumption, and \( \Delta Y_d \) is the change in disposable income. Typically, the \( MPC \) value is less than 1, indicating that not all of the additional income is spent.
Major Analytical Frameworks
Classical Economics
Classical economics posits that individuals operate based on rational self-interest with a focus on maximization. Therefore, any additional income will be used in ways that will maximize personal utility, incorporating both consumption and savings.
Neoclassical Economics
In the neoclassical framework, individuals are seen as rational actors who aim to maximize their utility over a lifetime, based on intertemporally-consistent choices. This perspective dovetails with the concept of the life-cycle hypothesis.
Keynesian Economics
Keynes posited that during times of economic downturn, individuals inclined to save rather than spend can exacerbate economic stagnation. Thus, understanding the propensity to consume is vital for formulating policies aimed at stimulating demand.
Marxian Economics
Marxist economists view consumption in the context of social classes. The propensity to consume could vary significantly across different social strata due to inherent structural inequalities.
Institutional Economics
This school emphasizes how consumption behaviors are embedded within social norms and institutions, affecting both the APC and MPC in different communities or under different institutional arrangements.
Behavioral Economics
Behavioral economics explores how psychological factors and cognitive biases impact consumer spending behavior, challenging the notion of purely rational actors that neoclassical models assume.
Post-Keynesian Economics
Post-Keynesians build on Keynes’ insights, emphasizing the roles that endogenous money creation and financial stability play in determining consumption disparities.
Austrian Economics
Austrian economists emphasize individual choice and subjective theory of value, predicting that propensity to consume will vary widely among individuals based on personal preferences and subjective valuations.
Development Economics
In developing economies, the propensity to consume is often analyzed in light of poverty reduction and economic development, where higher consumption propensities can potentially lead to more significant economic growth.
Monetarism
Monetarists argue that controlling the money supply is crucial to managing the economy, which in turn affects consumption behavior indirectly.
Comparative Analysis
Propensity to consume varies due to multiple variables, including macroeconomic environment, policies, social norms, and psychological factors. This complex interplay organically drives different consumption and saving behaviors across different societies and periods.
Case Studies
The Great Depression
During the Great Depression, the marginal propensity to consume lowered significantly as people opted to save more out of fear of future economic uncertainty.
Post-WWII Economic Boom
In post-WWII America, an increase in disposable incomes paired with high consumer confidence resulted in a high marginal propensity to consume, driving economic growth.
Suggested Books for Further Studies
- “The General Theory of Employment, Interest, and Money” by John Maynard Keynes.
- “Macroeconomics” by N. Gregory Mankiw.
- “Principles of Economics” by Alfred Marshall.
- “Behavioral Economics and its Applications” by Peter Diamond and Hannu Vartiainen.
- “Capital in the Twenty-First Century” by Thomas Piketty.
Related Terms with Definitions
- Disposable Income: Income remaining after deduction of taxes and social security charges, available to be spent or saved.
- Savings: The portion of disposable income that is not spent on consumption of consumer goods but accumulated or invested.
- **Consumption Function
