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Exercises · Q6

Q.Explain 'Paradox of Thrift'.

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The Paradox of Thrift describes a situation where an increase in the desire to save by all individuals in an economy can lead to a fall in aggregate demand, a reduction in overall income, and ultimately, a decrease in or unchanged aggregate saving.

The Paradox of Thrift is a macroeconomic concept that highlights a counter-intuitive outcome: while saving is generally considered a virtue for an individual, a collective increase in saving across an entire economy can be detrimental, leading to a recession or a fall in national income. This idea challenges the classical economic view that saving is always beneficial.

At the individual level, saving is prudent. It provides financial security, allows for future consumption, and can be used for investment. If an individual saves more, they are better off. However, the paradox arises when this individual rationality is scaled up to the entire economy.

In a simple macroeconomic model, one person's spending is another person's income. When individuals decide to save more, they simultaneously decide to consume less. If everyone in the economy attempts to save more, it means there is a collective reduction in consumption expenditure. This reduction in consumption directly translates to a fall in aggregate demand (ADAD).

AD=C+I=Aˉ+cYAD = C + I = \bar{A} + cY

Where ADAD is aggregate demand, CC is planned consumption and II is planned (autonomous) investment. Adding the two autonomous terms gives Aˉ=Cˉ+Iˉ\bar{A} = \bar{C} + \bar{I}, so aggregate demand can be written AD=Aˉ+cYAD = \bar{A} + cY, where cc is the marginal propensity to consume. This chapter works with a two-sector economy (households and firms only), so aggregate demand has just these two components — there is no government spending or net-export term.

When consumption (CC) falls, the aggregate demand curve shifts downwards. This fall in aggregate demand leads to a reduction in the production of goods and services, as firms face lower demand for their output. Consequently, national income (YY) and employment levels fall.

This initial fall in income is further amplified by the multiplier effect. A reduction in income for some individuals leads to a further reduction in their consumption, which in turn reduces the income of others, and so on. This chain reaction continues until the economy reaches a new, lower equilibrium level of income. …

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