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Summary IB Economics RWE price ceiling (rent cap)

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Written by a student who scored a 7 in HL IB economics, this document consists of a real-world example (RWE) -- required in IB DP econ paper 1 part b -- of a price ceiling being used to solve market failure, improve community surplus and minimise welfare loss through government intervention. It includes analysis, synthesis and evaluation to score the top marks of the 15-marker questions.

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Institution
Senior / 12th Grade
Course
IB Economics

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Price ceiling: rent cap in Berlin

Problem before the rent cap:
-​ Rents on tenancies had been increasing a lot, by 40% for existing tenancies and by 65% for
new tenancies since 2009.
-​ Between 2008 and 2018, rental prices nearly doubled creating affordability challenges for
residents.

Measures:
-​ In February 2020, a new law was passed where rents that exceeded an established cap by
more than 20% had to be reduced.
-​ The rent cap law froze rental prices at 2019 levels for five years and limited future
rent increases.
-​ It was estimated that over 365,000 were eligible for the rent reduction.
-​ In the short term, the rent cap offers protection for tenants.
-​ it was designed to prevent displacement of low- and middle-income tenants.

Advantages:
-​ Politically popular policy.
-​ Affordability: the rent cap stabilised housing costs for many tenants, especially those in
lower-income brackets.
-​ Social equity: helped prevent displacement of vulnerable populations.
-​ Provided immediate relief to renters in a city where over 80% of residents rent their homes.

Solves inequity and unaffortability in the housing sector.

Disadvantages:
-​ However, there have been reports of a shadow rental market, offsetting the amount lost due to
the cap.
-​ The German Landords’ Association has argued that the cap will lead to housing shortages and
scare off investors.
-​ Many landlords withdrew properties. A report by the German Economic Institute
(IW) in 2021 found that the number of rental advertisements in Berlin dropped by
over 40% within the first year of the rent caps being implemented.
-​ Data from the Berlin-Brandenburg Statistics Office showed that the annual number of
building permits for new housing units fell by 11% in 2020 compared to 2019.
Developers cited reduced profitability and regulatory uncertainty as key factors.
-​ Berlin's residential vacancy rate dropped to 1.1% by 2021, one of the lowest rates in
Germany, exacerbating the challenges for renters seeking affordable housing.
-​ Creates allocative inefficiency and deadweight loss, reducing the total surplus in the market.

Short-term: provided immediate relief to tenants but did not address the root cause of high rents ー
insufficient housing supply.

Long-term: by discouraging new construction and landlord investment, rent caps likely contributed
to worsening supply-side constraints.

!!!!!!!!! NO LONGER IN PLACE ー In April 2021, Germany's Constitutional Court struck down the
Mietendeckel, ruling that Berlin's government lacked the authority to impose the law, creating
uncertainty for tenants.

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Institution
Senior / 12th grade
Course
IB Economics
School year
4

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Uploaded on
August 19, 2025
Number of pages
1
Written in
2025/2026
Type
SUMMARY

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