model-cost-to-originate

name	model-cost-to-originate
description	Compute cost-to-originate (fixed + variable per loan) and the breakeven volume that the rate swing must clear. Reach for this on a unit-economics question.

Skill: Model cost-to-originate

A shop that doesn't know its cost-to-originate dies in the downturn (§3 #5).

Step 1 — Split the cost

Fixed cost and variable cost per loan.

Step 2 — Compute cost-to-originate

(fixed + variable × loans) ÷ loans via mortgage_lending_calc.py cost-to-originate (§3 #5).

Step 3 — Find the breakeven

Fixed cost ÷ margin-per-loan = breakeven volume (§3 #5).

Step 4 — Stress the rate swing

Compare breakeven to a downturn volume projection (§3 #7).

Output

A cost-to-originate and breakeven read stressed against the rate-cycle volume swing.