Housing bubble

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A housing bubble (or a housing price bubble) is one of several types of asset price bubbles which periodically occur in the market. The basic concept of a housing bubble is the same as for other asset bubbles, consisting of two main phases. First there is a period where house prices increase dramatically, driven more and more by speculation. In the second phase, house prices fall dramatically. Housing bubbles tend to be among the asset bubbles with the largest effect on the real economy, because they are credit-fueled, [1] because a large number of households participate and not just investors, and because the wealth effect from housing tends to be larger than for other types of financial assets. [2]

Contents

Housing bubble definition

Most research papers on housing bubbles use standard asset price definitions. There are many definitions of bubbles. Most of them are normative definitions, like that of Joseph Stiglitz (1990), [3] that try to describe bubbles as periods involving speculation, or argue that bubbles involve prices that cannot be justified by fundamentals. Examples are Palgrave (1926), [4] Flood and Hodrick (1990), [5] Robert J. Shiller (2015), [6] Smith and Smith (2006) [7] and Cochrane (2010). [8]

Stiglitz's definition is: "...the basic intuition is straightforward: if the reason that the price is high today is only because investors believe that the selling price will be high tomorrow—when ‘fundamental' factors do not seem to justify such a price—then a bubble exists." (Stiglitz 1990, p. 13) [3]

Lind (2009) [9] argued that we needed a new definition of price bubbles in the housing market, an "anti-Stiglitz" definition. His point is that traditional definitions such as that of Stiglitz (1990), [3] in which bubbles are proposed as arising from prices not being determined by fundamentals, are problematic. This is primarily because the concept "fundamentals" is vague, but also because these type of nominal definitions typically do not refer to a bubble episode as a whole—with both an increase and a decrease of the price. Lind claims that the solution is to define a bubble by focusing only on the specific development of prices and not on why prices have developed in a certain way. The general definition of a bubble would then simply be: "There is a bubble if the (real) price of an asset first increases dramatically over a period of several months or years and then almost immediately falls dramatically." (Lind 2009, p. 80) [9]

Inspired by Lind (2009), [9] Oust and Hrafnkelsson (2017) created the following housing bubble definition: "A large housing price bubble has a dramatic increase in real prices, at least 50% during a five-year period or 35% during a three-year period, followed by an immediate dramatic fall in the prices of at least 35%. A small bubble has a dramatic increase in real prices, at least 35% during a five-year period or 20% during a three-year period, followed by an immediate dramatic fall in the prices of at least 20%." [10]

Identifying housing bubbles

Housing bubbles vs. overpricing in the housing market

Overpricing can be said to be a necessary, but insufficient indicator that a bubble exists. Overpricing is defined more widely than a bubble. An asset may be overpriced without there being a bubble, but you cannot have a (positive) bubble without overpricing. Over- or underpricing may simply be defined as a deviation from the equilibrium price. DiPasquale and Wheaton (1994) [11] say that: "Indeed, it appears to be normal for housing prices to deviate from the fundamental value or equilibrium price, since housing markets clear gradually rather than quickly in a short run."

Mayer (2011) [12] investigated house price bubbles and found that there are basically three approaches researchers take when investigating house price differ from equilibrium.

First, there is the finance-based method, where the house price equals the discounted future rents. This follows the same logic when performing a stock valuation; the stock price is equal to the discounted sum of all future dividends. The idea is that the value of equity is equal to the discounted dividends. Price rent ratio and user cost of housing are methods that fall under this method.

The second approach is to compare the costs of building new dwellings against the actual house prices today. Much of the construction cost method has its basis in the demand and supply curve theory. If demand is low, this leads to lower house prices and less construction of new homes. Glaeser and Gyourko (2005) [13] point out that the housing market is characterized by a kinked supply curve that is highly elastic when prices are at or above construction costs. Otherwise, the supply curve is highly inelastic. Housing can be built rather quickly, but since housing is a durable good, old housing does not disappear quickly. Thus, house prices in slow or negative demand growth markets are capped by construction costs. Price construction cost ratio and price building cost ratio are methods that is falls in under this method.

The last approach by Mayer (2011) [12] is to utilize a combination of house price affordability to derive an equilibrium model. Often house prices are compared to income (income is used as proxy variable for affordability). If house prices are too high, households cannot afford the same level of housing services (affordability). Symmetrically, when house prices are low, households may afford a higher level of housing services. Price income ratio, price wage ratio, price household income ratio are examples of this method. There also exist a set of different affordability measures and indexes that looks at the development in interest payments to income or the cost of the mortgage to income. In addition to using house price equilibrium based on economic measures, there are also possible to use statistical techniques to identifying the long-term price trend, for example HP-filter.

Shiller's bubble checklist (2010)

  1. Sharp increases in the price of an asset like real estate or shares
  2. Great public excitement about said increases
  3. An accompanying media frenzy
  4. Stories of people earning much money, causing envy among people who are not
  5. Growing interest in asset class among the general public
  6. "New era" theories to justify unprecedented price increases
  7. A decline in lending standards [14]

Lind's housing bubble indicator groups (2009)

  1. Interest payments in relation to income for homebuyers
    1. Nominal interest payments in relation to income have been increasing.
    2. Nominal interest payment in relation to income would have been increasing if historical interest rate levels were applied.
    3. Real interest payments in relation to income have been increasing.
    4. Real interest payments in relation to income would have been increasing if historical interest rate levels were applied.
  2. Housing supply
    1. The easier it is to increase supply, the more likely is the increased price a part of a bubble
  3. Buyer expectations about prices
    1. Buyers expect prices to continue to rise or to stabilize on a level that is much higher than historical trends.
    2. Buyers believe that even in a median term perspective (three to five years) investing in housing is almost risk‐free.
  4. Buyers risk‐taking and impatience
    1. People are entering ownership at an earlier age or at a higher quality level.
    2. Buyers tend to choose riskier financing alternatives than earlier.
    3. Buyers are amortizing less than earlier.
  5. Bank behavior
  6. Banks are increasing or at least not decreasing loan to value ratios for buyers on the housing market when prices increase.
    1. Banks become more liberal when judging the credit worthiness of households.
  7. Speculative behavior
    1. A larger share of home‐buyers than usual are planning to sell rather quickly again. [9]

Other housing bubble indicators

Historical housing bubbles

Large housing bubbles in OECD counties 1970–2015

Price change prior to/after peakPrice change prior to/after peakPrice change prior to/after peakPrice change prior to/after peakPrice change prior to/after peak
CountryPricePeaks/troughsDuration (Quarters)AggregatedAggregated 5 yearAn. 5Y averageAggregated 3 yearAn. 3Y average1 year
FinlandIncrease1989-Q21568.3 %63.3 %12.7 %65.8 %21.9 %24.1 %
FinlandFall1995-Q426-50.5 %-46.0 %-9.2 %41.0 %-13.7 %-11.9 %
Ireland Increase2007-Q156235.6 %52.9 %10.6 %30.5 %10.2 %10.1 %
Ireland Fall2013-Q124-53.6 %-51.6 %-10.3 %-31.8 %-10.6 %-7.1 %
NetherlandsIncrease1978-Q233138.9 %94.4 %18.9 %69.0 %23.0 %6.5 %
NetherlandsFall1985-Q329-52.6 %-47.9 %-9.6 %-35.5 %-11.8 %-11.8 %
New ZealandIncrease1974-Q31866.2 %*66.2 %14.7 %64.4 %21.5 %29.9 %
New ZealandFall1980-Q425-39.4 %-34.7 %-6.9 %-22.7 %-7.6 %-9.2 %
NorwayIncrease1987-Q1844.0 %37.8 %7.6 %39.8 %13.3 %25.0 %
NorwayFall1993-Q124-45.5 %-41.2 %-8.2 %-28.6 %-9.5 %-2.3 %
South AfricaIncrease1984-Q12155.1 %54.9 %11.0 %25.5 %8.5 %9.2 %
South AfricaFall1987-Q112-44.1 %-42.8 %-8.6 %-44.1 %-14.7 %-18.1 %
Spain Increase2007-Q241138.8 %69.2 %13.8 %30.1 %10.0 %9.0 %
Spain Fall2014-Q127-45.5 %-36.0 %-7.2 %-14.1 %-4.7 %-4.5 %
UKIncrease1973-Q31467.4 %*67.4 %19.3 %66.2 %22.1 %23.5 %
UKFall1977-Q316-35.6 %-29.3 %-5.9 %-28.9 %-9.6 %-11.2 %
USA Increase2006-Q13892.9 %54.1 %10.8 %35.4 %11.8 %7.8 %
USA Fall2011-Q423-39.6 %-37.1 %-7.4 %-33.0 %-11.0 %-4.3 %

The table is from Oust and Hrafnkelsson (2017) [10] and has been constructed using their bubble definition. The dataset consists of quarterly real prices for 20 OECD countries from 1970 to 2015. Duration is the number of quarters since the last turning point (or from the start of the data series). Aggregated price change is the aggregate price change for the duration. *The aggregated price change is from the start of the period to the peak.

Small housing bubbles in OECD countries 1970–2015

Price change prior to/after peakPrice change prior to/after peakPrice change prior to/after peakPrice change prior to/after peakPrice change prior to/after peak
CountryPricePeaks/troughsDurationAggregatedAggregated 5 yearAn. 5Y averageAggregated 3 yearAn. 3Y average1 year
BelgiumIncrease1979-Q33159.6 %33.4 %6.7 %21.2 %7.1 %3.9 %
BelgiumFall1985-Q223-40.4 %-36.8 %-7.4 %-26.5 %-8.8 %-7.1 %
DenmarkIncrease1986-Q21455.8 %29.9 %6.0 %31.5 %10.5 %14.0 %
DenmarkFall1993-Q228-36.5 %-29.4 %-5.9 %-19.2 %-6.4 %-12.5 %
DenmarkIncrease2006-Q353180.1 %63.9 %12.8 %60.0 %20.0 %21.1 %
DenmarkFall2012-Q425-28.5 %-25.0 %-5.0 %-21.1 %-7.0 %-0.7 %
FinlandIncrease1974-Q21028.8 %*27.9 %6.6 %28.5 %9.5 %6.8 %
FinlandFall1979-Q321-34.0 %-33.8 %-6.8 %-26.6 %-8.9 %-13.5 %
IrelandIncrease1980-Q44344.3 %44.3 %8.9 %29.2 %9.7 %5.8 %
IrelandFall1987-Q226-35.3 %-29.0 %-5.8 %-25.7 %-8.6 %-7.0 %
ItalyIncrease1981-Q21340.6 %26.8 %5.4 %36.5 %12.2 %19.2 %
ItalyFall1986-Q422-27.8 %-27.6 %-5.5 %-18.5 %-6.2 %-4.8 %
JapanIncrease1973-Q41560.9 %*60.9 %16.2 %47.5 %15.8 %17.0 %
JapanFall1977-Q315-34.2 %-32.3 %-6.5 %-31.5 %-10.5 %-17.6 %
JapanIncrease1990-Q45379.6 %37.6 %7.5 %22.9 %7.6 %9.7 %
JapanFall2009-Q274-49.5 %-17.3 %-3.5 %-14.3 %-4.8 %-3.3 %
KoreaIncrease1979-Q23788.5 %88.5 %17.7 %72.3 %24.1 %5.4 %
KoreaFall1982-Q212-33.6 %-15.2 %-3.0 %-33.6 %-11.2 %-14.8 %
KoreaIncrease1991-Q11434.3 %27.0 %5.4 %25.7 %8.6 %8.1 %
KoreaFall2001-Q140-48.5 %-33.0 %-6.6 %-25.8 %-8.6 %-11.6 %
SpainIncrease1978-Q2929.7 %40.6 %8.1 %24.1 %8.0 %12.2 %
SpainFall1982-Q418-36.7 %-30.8 %-6.2 %-25.9 %-8.6 %-10.4 %
SpainIncrease1991-Q436142.3 %102.4 %20.5 %34.2 %11.4 %10.9 %
SpainFall1997-Q121-21.2 %-21.0 %-4.2 %-18.7 %-6.2 %-12.5 %
SwedenIncrease1990-Q11746.6 %42.5 %8.5 %35.9 %12.0 %8.8 %
SwedenFall1995-Q423-31.9 %-30.0 %-6.0 %-28.4 %-9.5 %-1.6 %
SwitzerlandIncrease1973-Q11227.7 %*27.7 %9.2 %27.7 %9.2 %17.7 %
SwitzerlandFall1976-Q314-28.4 %-26.6 %-5.3 %-27.8 %-9.3 %-10.6 %
SwitzerlandIncrease1989-Q45372.1 %38.1 %7.6 %28.7 %9.6 %4.6 %
SwitzerlandFall2000-Q141-38.6 %-27.6 %-5.5 %-21.6 %-7.2 %-8.0 %
UKIncrease1989-Q330103.6 %77.8 %15.6 %58.1 %19.4 %10.6 %
UKFall1995-Q425-29.3 %-26.6 %-5.3 %-24.7 %-8.2 %-9.4 %

The table is from Oust and Hrafnkelsson (2017) [10] and has been constructed using their bubble definition. The dataset consists of quarterly real prices for 20 OECD countries from 1970–2015. Duration is the number of quarters since the last turning point (or from the start of the data series). Aggregated price change is the aggregate price change for the duration. * The aggregated price change is from the start of the period to the peak.

See also

For individual countries, see:

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References

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