How does the healthcare insurance + hospital example demonstrate MPC's value?

Question

Accepted Answer

MPC (Secure Multi-Party Computation) lets two or more parties jointly compute a function over their combined data while each keeps its own inputs private. Here, an insurer and a hospital can jointly compute statistics (e.g. correlate treatments with outcomes or costs) over their shared patients without either disclosing its private records to the other.
The insurer holds claims/cost data; the hospital holds clinical/treatment data — about overlapping patients. Each is bound by privacy law (and competitive interest) not to share raw patient records.
With MPC:

They run a joint analysis (e.g. "which treatments lower long-term costs?").
The hospital never sees the insurer's financials; the insurer never sees diagnoses.
Only the aggregate insight emerges.

Why it matters: This unlocks collaborations that would otherwise be legally impossible — research, fraud detection, and public-health analytics across institutions that cannot pool raw data.