ECON204 Lecture Notes - Lecture 6: Liquidity Trap, Deflation, Monetary Policy

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17 May 2018
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Topic 6
Financial crises
After 2008, much of the world economy suffered an intense economic crisis. Output falls in
advanced countries (not Australia) were the largest since the Great Depression. The recovery has
been slow, and is still modest.
We will examine:
The triggers in US housing price falls, and the impact on banks
The monetary and fiscal policy responses restricted by the liquidity trap and the build up of
government debt
Why the recovery has been so slow.
What to expect from 2017 onwards.
From a housing problem to a financial crisis
What caused the sharp rise in house prices form 2000-6?
Very low interest rates
Mortgage lenders were lending more to risky borrowers: sub-prime mortgages. All bad? Not
necessarily --- it expanded home ownership, which was good so long as prices always went
up.
But
But house prices started to fall after 2006.
Ma otgages et udeate hee the otgage eeeds the house alue.
The mortgages turned out to be riskier than investors or borrowers realized.
Many borrowers defaulted, and banks incurred big losses.
In mid-2008, the losses were thought to be US$300bn (2% of GDP), which the financial
sector could easily absorb.
The losses turned out much bigger, and were amplified throughout the financial system
The role of banks in the crisis
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Baks keep apital the ak oes o fuds as a uffe agaist shoks.
Banks get into trouble if:
Assets (like mortgages) suddenly decline in value if liabilities (not including capital) exceed
assets, this bank is insolvent.
Depositors want to withdraw too much of their money (liabilities). The bank could sell some
assets, but it may take too long. The bank may then be solvent but illiquid.
In 2008, banks suffered from all of these factors: too little capital, big declines in mortgage-related
asset values; too liquid liabilities that were being withdrawn; and illiquid assets that were difficult to
sell.
Leverage
Capital Ratio = Capital / Assets
Leverage Ratio = Assets / Capital
o Banks with a high leverage ratio are at higher risk of bankruptcy, even from smaller
losses.
o But, high leverage means higher expected profit.
Let R(A) be the % return on assets, R(L) the % cost of liabilities
Expected rate of return on capital = 

In 2000s, many US financial institutions decided to get a higher expected return, but then took on
much more risk. This was because:
They underestimated the risk
Compensation and bonus system encouraged risk-taking
Banks found clever ways to avoid regulations --- Structured Investment Vehicles (SIVs)
Structured Investment Vehicles (SIVs)
To aoid apital atio egulatio, aks set up “IVs as itual aks at as legth. They were not
directly (legally) linked to the parent banks. So the parent banks did not have to report them. Since
the “IVs did ot appea o the paet aks alae sheet, the esaped egulatio. This eat
higher leverage ratios and greater expected etus though this shado akig sste.
The first was created by Citigroup in 1988, and grew rapidly in 2000s. (By October 2008, all were
gone)
Liabilities: short term debt borrowed from investors (with a guarantee from parent bank)
Assets: various securities e.g. securitised mortgages, including sub-prime ones! (with accompanying
insurance against default using credit default swaps CDSs mainly provided by AIG).
When housing prices fell, mortgage-based securities went bad, SIVs and their parent banks had too
little apital, ad the uegulated default isue AIG ouldt oe the losses. The U“ goeet
had to step in.
Complexity
Very complex financial instruments were developed in the securitisation process.
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