ECON10003 Lecture Notes - Lecture 7: Government Spending, Real Interest Rate, Permanent Income Hypothesis

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Importance of expectations: a key implication, government policy can help stabilise the economy. If there is a change in export demand, what would be the change in economic output. Investment: planned investment is taken as exogenous, firms have some level of capital investment they would like to achieve, firms have some level of inventories they would like to maintain. Independent from income: depends upon, the real interest rate, opportunity cost of investment, animal spirits beliefs about the future profitability of investment (expectations) Equilibrium: why is (cid:1851)=(cid:1842)(cid:1831) a reasonable condition? inventories. If (cid:1851)>(cid:1842)(cid:1831) then actual investment exceeds desired investment build up of. Equilibrium: algebraic representation: recall, together imply, could repeat the same exercise with a non-trivial tax system, = +(cid:1855)(cid:4666)(cid:1851) (cid:4667, (cid:1835),(cid:1833),(cid:1850) are exogenous, (cid:1851)=+(cid:1835)+(cid:1833)+(cid:1850, for illustrative purposes, set =(cid:882) (cid:1851)= +(cid:1855)(cid:1851)+(cid:1835)+(cid:1833)+(cid:1850) (cid:4666)(cid:883) (cid:1855)(cid:4667)(cid:1851)= +(cid:1835)+(cid:1833)+(cid:1850) (cid:1851)= +(cid:1835)+(cid:1833)+(cid:1850) (cid:883) (cid:1855) (cid:1851)= +(cid:1855)(cid:4666)(cid:1851) (cid:4667)+(cid:1835)+(cid:1833)+(cid:1850)

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