
Banks and Insurers: Investment Strategies and Asset and Liability Volatility 383
Portfolio Strategy
Considerations
Main Factors
Aected Explanation/Rationale Additional Regulatory Concerns
Maintain reasonable
balance between asset and
liability durations, key rates
durations, and sensitivity
to embedded borrower and
claimant options
Increases ρ Requires more in-depth analysis than
simple duration-matching strategy,
because must account for convex-
ity and asymmetric payos due to
(i) defaults, (ii) principal payos
prior to maturity, and (iii) annu-
ity, life-insurance policy, and bank
CD surrenders in high interest rate
scenarios.
Regulatory structures penalize
institutions with unjustiable asset/
liability mismatches.
Common Stock Investments Increases σ
ΔA
_
A
,
typically decreases
ρ
Equity and other high-volatility assets
provide only slight diversication
benets while adding to volatility.
Also, common stock returns do not
correlate well with nancial institu-
tion returns, which pushes correla-
tion, ρ, away from 1.0 toward 0.0.
Most regulatory structures require
100% or more risk weighting for
common stock investments thus,
such investments are ineligible for
backing nancial liability issuance.
Derivatives transparency,
collateralization
Decreases both
σ
ΔA
_
A
and σ
ΔL
_
L
and
increases ρ
Whether derivatives are used to
hedge or synthesize (i) assets or (ii)
liabilities, the more “plain vanilla”
(and protected against counterparty
default) they are, the less likely they
will revalue in unexpected directions.
Transparency fosters regulatory
“nancial stress test” condence. It
also allows regulators and claim-
ants to ascertain whether deriva-
tives are being used in a justiable
manner.
Liquidity of portfolio
investments Decreases σ
ΔA
_
A
Includes short-maturity debt securi-
ties of highly rated issuers, currency
reserves, access to credit lines, and
access for banks to emergency central
bank borrowing.
Problems occur for regulators
when nancial contagion extends
beyond just a few institutions.
Surrender penalties Decreases σ
ΔL
_
L
For typical life insurance, annuities,
and bank deposits, such penalties
cushion losses to nancial institu-
tions for having to pay back liabilities
“at par” when rising interest rates
would otherwise have reduced the
discounted present value of the
obligations.
Properly computed surrender
penalties must account for interest
rate volatility and slope of the
yield curve. Typically, regulators/
customers do not tolerate econom-
ically justied surrender penalties
(they are usually priced too low to
oset the institution’s risk).
Prepayment penalties on
debt investments
Increases ρ When interest rates are declining,
borrowers must incur a penalty to
repay loans at par to renance.
Also, prepayment penalties help
institutions oset rising values of
their xed-rate liabilities in falling
rate environments.
None.
Catastrophic insurance risks Increases σ
ΔL
_
L
By denition, these losses faced by
insurance companies are less predict-
able and possibly very large.
Regulators and insurance custom-
ers usually expect (i) higher capital
ratios, (ii) higher quality and liquid
investment portfolios, and (iii)
strong reinsurance agreements
compared with typical home,
health, auto, and re insurance.