The government wants to boost the economy,let's say the consumption function is C = $500 billion + 0.9Y. the first change in aggregate demand at present prices with (a) 50 billion, (b) 45 billion, (c) 45 billion, (d) 500 billion, (e) 450 billion, (f) 450 billion.
According to the traditional consumption function, increases in income and consumer spending are entirely correlated. If this were the case, aggregate savings ought to rise proportionately as the GDP does over time. The goal is to establish a mathematical link between consumer spending and disposable income, but only at the aggregate level. One of the pillars of Keynesian macroeconomic theory is the stability of the consumption function, which is based in part on Keynes' Psychological Law of Consumption and is particularly striking when compared to the volatility of investment. The majority of post-Keynesians acknowledge that because spending habits vary as income increases, the consumption function is not long-term stable.
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