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Incident 149: Zillow Shut Down Zillow Offers Division Allegedly Due to Predictive Pricing Tool's Insufficient Accuracy

Description: Zillow's AI-powered predictive pricing tool Zestimate was allegedly not able to accurately forecast housing prices three to six months in advance due to rapid market changes, prompting division shutdown and layoff of a few thousand employees.

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Entities

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Alleged: Zillow Offers developed an AI system deployed by Zillow, which harmed Zillow and Zillow Offers staff.

Incident Stats

Incident ID
149
Report Count
4
Incident Date
2021-11-02
Editors
Sean McGregor, Khoa Lam
Applied Taxonomies
GMF, CSETv1, MIT

CSETv1 Taxonomy Classifications

Taxonomy Details

Incident Number

The number of the incident in the AI Incident Database.
 

149

Special Interest Intangible Harm

An assessment of whether a special interest intangible harm occurred. This assessment does not consider the context of the intangible harm, if an AI was involved, or if there is characterizable class or subgroup of harmed entities. It is also not assessing if an intangible harm occurred. It is only asking if a special interest intangible harm occurred.
 

no

Date of Incident Year

The year in which the incident occurred. If there are multiple harms or occurrences of the incident, list the earliest. If a precise date is unavailable, but the available sources provide a basis for estimating the year, estimate. Otherwise, leave blank. Enter in the format of YYYY
 

2021

Date of Incident Month

The month in which the incident occurred. If there are multiple harms or occurrences of the incident, list the earliest. If a precise date is unavailable, but the available sources provide a basis for estimating the month, estimate. Otherwise, leave blank. Enter in the format of MM
 

11

Estimated Date

“Yes” if the data was estimated. “No” otherwise.
 

Yes

Multiple AI Interaction

“Yes” if two or more independently operating AI systems were involved. “No” otherwise.
 

no

GMF Taxonomy Classifications

Taxonomy Details

Known AI Technology Snippets

One or more snippets that justify the classification.
 

(Snippet Text: "We've determined the unpredictability in forecasting home prices far exceeds what we anticipated and continuing to scale Zillow Offers would result in too much earnings and balance-sheet volatility," said Rich Barton, Zillow's co-founder and CEO., Related Classifications: Regression), (Snippet Text: For Zillow, one of the first steps in its decision to purchase any home is the "Zestimate" — a machine-learning-assisted estimate of a home's market value that is calculated by taking into account oodles of data about the property gathered from sources including tax and property records, homeowner-submitted details such as the addition of a bathroom or bedroom, and pictures of the house., Related Classifications: Multimodal Learning, Diverse Data)

MIT Taxonomy Classifications

Machine-Classified
Taxonomy Details

Risk Subdomain

A further 23 subdomains create an accessible and understandable classification of hazards and harms associated with AI
 

7.3. Lack of capability or robustness

Risk Domain

The Domain Taxonomy of AI Risks classifies risks into seven AI risk domains: (1) Discrimination & toxicity, (2) Privacy & security, (3) Misinformation, (4) Malicious actors & misuse, (5) Human-computer interaction, (6) Socioeconomic & environmental harms, and (7) AI system safety, failures & limitations.
 
  1. AI system safety, failures, and limitations

Entity

Which, if any, entity is presented as the main cause of the risk
 

AI

Timing

The stage in the AI lifecycle at which the risk is presented as occurring
 

Post-deployment

Intent

Whether the risk is presented as occurring as an expected or unexpected outcome from pursuing a goal
 

Unintentional

Incident Reports

Reports Timeline

+1
Zillow to exit its home buying business, cut 25% of staff
Zillow's home-buying debacle shows how hard it is to use AI to value real estateWhy Zillow Couldn’t Make Algorithmic House Pricing WorkWhat happened at Zillow? How a prized real estate site lost at iBuying
Zillow to exit its home buying business, cut 25% of staff

Zillow to exit its home buying business, cut 25% of staff

cnn.com

Zillow's home-buying debacle shows how hard it is to use AI to value real estate

Zillow's home-buying debacle shows how hard it is to use AI to value real estate

cnn.com

Why Zillow Couldn’t Make Algorithmic House Pricing Work

Why Zillow Couldn’t Make Algorithmic House Pricing Work

wired.co.uk

What happened at Zillow? How a prized real estate site lost at iBuying

What happened at Zillow? How a prized real estate site lost at iBuying

cnet.com

Zillow to exit its home buying business, cut 25% of staff
cnn.com · 2021

Zillow is getting out of the iBuying business and will shut down its Zillow Offers division, resulting in a 25% reduction in its staff.

In its quarterly earnings report on Tuesday, the company said it will see a total write-down of more tha…

Zillow's home-buying debacle shows how hard it is to use AI to value real estate
cnn.com · 2021

In February, Zillow appeared so confident in its ability to use artificial intelligence to estimate the value of homes that it announced a new option: for certain homes, its so-called "Zestimate" would also represent an initial cash offer f…

Why Zillow Couldn’t Make Algorithmic House Pricing Work
wired.co.uk · 2021

Zillow's Zestimate of home values has become a go-to reference for US homeowners. But when Zillow tried to use its algorithm to buy and sell homes, it badly misread the market.

The company’s iBuyer (or “instant buyer”) arm, where tech-first…

What happened at Zillow? How a prized real estate site lost at iBuying
cnet.com · 2021

Zillow, the popular online real estate marketplace and daydream fuel throughout the pandemic, is having a tough time. 

The company turned heads earlier this month when it announced it would be shutting down Zillow Offers, the algorithm-fuel…

Variants

A "variant" is an incident that shares the same causative factors, produces similar harms, and involves the same intelligent systems as a known AI incident. Rather than index variants as entirely separate incidents, we list variations of incidents under the first similar incident submitted to the database. Unlike other submission types to the incident database, variants are not required to have reporting in evidence external to the Incident Database. Learn more from the research paper.

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