What if young adults stop forming households and buying homes?
Collapsing young-adult household formation removes the entry-level housing bid across DM economies — a slow demographic demand void best read as a recession/risk-appetite drag on homebuilders and starter-home lenders. Rhymes with Japan's post-bubble formation collapse and the delayed US millennial household-formation trough after 2008. Transmission is into homebuilders, mortgage originators and building-products demand across the US/UK/Canada/Australia. Forward angle: affordability at multi-decade lows is the specific accelerant turning a demographic drift into an actual bid-removal. Roots reasonable.
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The butterfly cascade
How this trigger trickles across markets, left → right — the root shock, its first‑order moves, then the ripple effects. Drag any node; tap a market for its real price history.
Resolution timeline — how this probability is moving
Our model's odds (electric blue) over time vs the market's (Polymarket, amber), from the past toward the 3–10 years horizon. Each dot is a real macro event that nudged the probability — green pushed it up, red pushed it down. Tap a dot for the source. Loading the probability audit trail…
What it would mean
If this plays out, it is a risk-off shock. Collapsing household formation among young adults removes the entry-level housing bid across developed economies. The trigger decomposes into signed root‑shocks — Recession signal ▲ · Risk appetite ▼ — which propagate through our causal graph to the markets below.