By Mike Duncan | December 2025
Capital Economics of Modern Derivatives
Most institutions still treat collateral as plumbing. Post-crisis market structure has made that assumption expensive.
Initial margin, cash variation margin, segregation, and conservative margin models now immobilise balance-sheet capacity that was previously available to the portfolio. The costs do not appear as a single fee. They show up as idle cash, reduced liquidity flexibility, higher funding costs, and missed opportunities during stress – spread across silos, owned by nobody, and rarely aggregated into a total picture.
The result is chronic, largely invisible performance drag. Most portfolios do not underperform because markets move against them. They underperform because capital is quietly trapped in margins, buffers, and frictional processes that sit entirely outside the investment decision loop.
What this paper argues
Collateral drag is a governance problem, not an operational one. Until collateral is treated as balance-sheet capital competing with other uses, optimisation efforts remain cosmetic – improving reporting rather than outcomes. Four case studies show how this plays out in practice: the institution that optimised for safety and ran out of liquidity; the one whose collateral toolkit existed but could not be mobilised under time pressure; the one whose efficiency programme increased risk instead of reducing it; and the one that never knew where the drag was coming from because no single function ever saw the full picture.
What it covers
- How post-crisis market structure permanently altered the capital economics of derivatives
- Why lifecycle collateral costs are systematically underestimated and where the hidden drag accumulates
- Why operational alpha from collateral efficiency is real, persistent, and does not decay as markets become more competitive
- The three levers that actually matter: toolkit breadth, structural simplification, and cash versus derivatives discipline
- Why most collateral optimisation programmes fail – and the sequencing that works
- Four case studies showing failure modes across institutions with otherwise sophisticated investment and risk functions
- Why total portfolio thinking is the only framework that surfaces what collateral is actually costing
The central argument
Collateral is not neutral. It is not free. Treating it as plumbing in this environment is not conservative – it is imprecise. Institutions that surface collateral explicitly and measure its lifecycle cost are not taking more risk. They are eliminating blind spots.
Read the practitioner paper
Collateral Drag – Capital Economics of Modern Derivatives