Función de consumo y ahorro keynesiana

Understanding the Keynesian Consumption Function

This section delves into the Keynesian consumption function, highlighting its significance in understanding family consumption behavior as proposed by economist John Maynard Keynes.

Key Concepts of the Consumption Function

• The Keynesian consumption function emphasizes two critical factors influencing family consumption: autonomous consumption and disposable income. Autonomous consumption refers to essential expenses that occur regardless of income levels.

• The relationship between disposable income and family consumption is direct; as disposable income increases, so does consumption. This relationship is mathematically represented in the consumption function.

• Keynes introduced the concept of marginal propensity to consume (MPC), which measures how much additional income will be spent on consumption. MPC values range from 0 to 1, indicating that not all income is consumed.

• Graphically, the consumption function starts at a positive level due to autonomous consumption and has a positive slope reflecting the relationship with disposable income.

• When families' total income equals their total spending, they are consuming all available resources. If their income decreases while maintaining higher spending levels, it indicates borrowing or negative savings.

Transitioning to Saving Functions

• The saving function complements the consumption function since families allocate their disposable income between saving and consuming. Thus, total savings plus total consumption equals disposable income.

• The marginal propensity to save (MPS), derived from MPC, indicates how much of each euro earned is saved rather than spent. MPS also ranges from 0 to 1.

• Graphically representing the saving function shows it begins in a negative region when autonomous consumption exceeds zero but has a positive slope as savings increase with rising incomes.

• If families consume more than their earnings (negative savings), this situation occurs when incomes fall below certain thresholds while expenditures remain high.