📈 Zillow's iBuyer collapse is structural, not a stumble
Zillow Offers did not fail on execution alone: the Zestimate was built as lead-gen where an inflated price is the feature and accuracy is a bug, so underwriting home purchases off it guaranteed overpaying on a 3% margin of safety, and the new business was fundamentally competitive with the media/broker franchise it was supposed to feed. Friedberg adds that Zillow called itself a market maker while actually speculating on model-projected prices with nobody doing ground truth. The besties treat this as a lasting strategic wound at a company a Silicon Valley legend runs, not a fixable quarter.
0
CONVICTION
peaked 47.8 WATCH
DORMANT
band
▼ SHORT ZG
expression · bearish equities
HIT
outcome · R +52.8% · α +71.3%
2022-11-06
window closed
⚖ Why this verdict
fully deterministic — evaluate.py replays this from daily closes; nothing below is editable or hand-set
- Window: 2021-11-06 → 2022-11-06 — first mention + 12-month horizon, then the window locks.
- The call: ▼ SHORT ZG (primary play). ZG fell 52.8% over the window → direction-adjusted R = +52.8% (the call made money).
- Benchmark: holding SPY over the same window returned -18.5%
→ α = +52.8 − (-18.5) = +71.3%
— what this call made or lost against just owning the index. This is the number the verdict uses.
Stock-selection read: +34.3% — did ZG move the predicted way relative to the market. The two only differ on a SHORT: this call beat the index outright.
- Rule fired:
▶ HIT — R ≥ +10% AND α ≥ +5 ✓ (R 52.8, α 71.3)· PARTIAL — R ≥ +5% OR α ≥ 0· MISS — everything else
- Credit: supporters of a HIT earn 1.0 each, opposers the inverse — this feeds the scoreboard weights. supported: Chamath, Friedberg
Conviction timeline
bands: green ≥ 65 · watch ≥ 45 · ember ≥ 15
Plays vs SPY · % since first mention (2021-11-06)
Plays
| expression | symbol | kind | relevance | rationale |
|---|---|---|---|---|
| ▼ SHORT | ZG | stock | PRIMARY | the company that wrote off the iBuyer unit, cut 25% of staff and lost ~$9B of market cap in the week before this episode |
Mention log
Chamath
equities w=0.84 · n=160
· E54 (2021-11-06) · explicit_prediction · strength 3
▶ 40:46
SUPPORT
“it speaks to two big mistakes that Zillow made. The first is that catching a wave of disruption is very difficult when you have an old line business that is fundamentally competitive with the new line of business. ... Zestimate over time basically calcified this idea of price inflation. So the accuracy was never a goal. ... the open door margin on average is about 10%. The Zillow margin on average was 3%. So they had a much more razor thin margin of safety here, which again speaks to pricing.”
Friedberg
equities w=0.87 · n=120
· E54 (2021-11-06) · sentiment · strength 2
▶ 37:14
SUPPORT
“they were trying to be a, quote, market maker in the business. And it turned out that what they were really doing was being more of a speculator, right? ... one could argue this was flawed from the beginning. The execution clearly was way off. ... the maturity of a Silicon Valley entrepreneur who's crushed it so many times doesn't mean that they're perfect. And this was a big miss.”
Who built this conviction
each voice's total force on the score — supports and opposes from every mention, weighted exactly as the replay applied them · share = % of all mention-driven movement
⏳ decay drained -40.8 over the idea's life — that's time passing, attributed to no one
Score events
| episode | kind | Δ | after | note |
|---|---|---|---|---|
| E54 2021-11-06 | init | +35.2 | 35.2 | E54 born by Chamath (explicit_prediction x3) [w=0.84] |
| E54 2021-11-06 | reinforce | +12.6 | 47.8 | E54 Friedberg support x2 (new voice) [w=0.87] |
| E55 2021-11-13 | decay | -1.9 | 45.9 | E55 silent |
| E56 2021-11-20 | decay | -1.8 | 44.1 | E56 silent |
| E57 2021-12-04 | decay | -1.8 | 42.3 | E57 silent |
| E58 2021-12-11 | decay | -1.7 | 40.6 | E58 silent |
| E59 2021-12-17 | decay | -1.6 | 39.0 | E59 silent |
| E60 2021-12-23 | decay | -1.6 | 37.4 | E60 silent |
| E61 2021-12-29 | decay | -1.5 | 35.9 | E61 silent |
| E62 2022-01-08 | decay | -1.4 | 34.5 | E62 silent |
| E63 2022-01-15 | decay | -1.4 | 33.1 | E63 silent |
| E64 2022-01-22 | decay | -1.3 | 31.8 | E64 silent |
| E65 2022-01-29 | decay | -1.3 | 30.5 | E65 silent |
| E66 2022-02-05 | decay | -1.2 | 29.3 | E66 silent |
| E67 2022-02-12 | decay | -1.2 | 28.1 | E67 silent |
| E68 2022-02-19 | decay | -1.1 | 27.0 | E68 silent |
| E70 2022-02-24 | decay | -1.1 | 25.9 | E70 silent |
| E71 2022-03-05 | decay | -1.0 | 24.9 | E71 silent |
| E72 2022-03-19 | decay | -1.0 | 23.9 | E72 silent |
| E73 2022-03-26 | decay | -1.0 | 22.9 | E73 silent |
| E74 2022-04-01 | decay | -0.9 | 22.0 | E74 silent |
| E75 2022-04-09 | decay | -0.9 | 21.1 | E75 silent |
| E76 2022-04-16 | decay | -0.8 | 20.3 | E76 silent |
| E77 2022-04-23 | decay | -0.8 | 19.5 | E77 silent |
| E78 2022-04-30 | decay | -0.8 | 18.7 | E78 silent |
| E79 2022-05-07 | decay | -0.7 | 18.0 | E79 silent |
| E80 2022-05-13 | decay | -0.7 | 17.2 | E80 silent |
| E81 2022-05-23 | decay | -0.7 | 16.5 | E81 silent |
| E82 2022-05-24 | decay | -0.7 | 15.9 | E82 silent |
| E84 2022-06-24 | decay | -0.6 | 15.2 | E84 silent |
| E85 2022-06-30 | decay | -0.6 | 14.6 | E85 silent |
| E86 2022-07-08 | decay | -0.6 | 14.1 | E86 silent |
| E87 2022-07-14 | decay | -0.6 | 13.5 | E87 silent |
| E88 2022-07-22 | decay | -0.5 | 12.9 | E88 silent |
| E89 2022-07-29 | decay | -0.5 | 12.4 | E89 silent |
| E90 2022-08-05 | decay | -0.5 | 11.9 | E90 silent |
| E91 2022-08-13 | decay | -0.5 | 11.5 | E91 silent |
| E92 2022-08-20 | decay | -0.5 | 11.0 | E92 silent |
| E93 2022-08-26 | decay | -0.4 | 10.6 | E93 silent |
| E94 2022-09-01 | decay | -0.4 | 10.1 | E94 silent |
| E95 2022-09-10 | decay | -0.4 | 9.7 | E95 silent |
| E96 2022-09-17 | decay | -0.4 | 9.3 | E96 silent |
| E97 2022-09-23 | decay | -0.4 | 9.0 | E97 silent |
| E98 2022-10-01 | decay | -0.4 | 8.6 | E98 silent |
| E99 2022-10-07 | decay | -0.3 | 8.3 | E99 silent |
| E100 2022-10-14 | decay | -0.3 | 7.9 | E100 silent |
| E101 2022-10-22 | decay | -0.3 | 7.6 | E101 silent |
| E102 2022-10-29 | decay | -0.3 | 7.3 | E102 silent |
| E103 2022-11-05 | decay | -0.3 | 7.0 | E103 silent |