A performance issue. â«. Weak and correlated performance. â«. Limited number of strategies. â«. Small capacity wrt performance impact. Poor liquidity.
A simple framework Model : simple copula with three parameters
One correlation intra sector One correlation extra sector One correlation existing / new investors
At a given date (1M or according to fund liquidity) we get the pdf of the AUM
Avg AUM : 94 M$
Allocation model Portfolio model
One risky and non risky asset, no rate and dividend, simple BS model
dX = θ
dS , S
X0 = x
dS = μdt+ σdW S
One period model
At the end of the period the AUM is impacted by the redemption and the new investment
X → Xε( ω)
Rebalancing without impacting the portfolio risk profile
θ( ε( ω) − 1)
Allocation model Cost of rebalancing according to an average liquidity L
β( θ( ε( ω) − 1) − L ) + Optimal portfolio
Utility function
θ = ArgMin EU( X, ε( ω) ) Special case
ln U( x, ε ) = − λx + β( θ( ε − 1) − L ) +
Intuitive approach Liquidity option
1 2 2 2 ln EU( X, ε ) = −λθT + λ θ σ T + βCallL (θ ( ε - 1) ) 2 The optimal allocation accounts for the hedge of the option
θ = θ* − cDelta L ( θ( ε - 1) ) ≤ θ* :=
μ λσ2
Simple model result Target allocation in risky asset 55%
Beta : 10%
L : 20 %
% Change in risky asset allocation
If the proba of redemption increases, the investment in risky asset should decrease If the investors are “correlated”, the investment in risky asset should decrease
Combined model N agents, they “share” the liquidity option
1 U( X, ε ) = −λX + βCallL N
( ) θ ε 1 ∑i i i
Two extreme cases for 2 agents (Proba redemption : 20, corr : 50%) Same investors :
- 14.6%
Independent investors :
- 7,9%
Intuitive result : at the limit, if the investors are “random”, almost no impact but if the investors are “shared” the risk is huge
Conclusion The HF industry moved from “random” or “positive” flow of AUM to highly correlated outflows It is crucial to quantify and manage the investors risk Key points
Better knowledge of investors
Diversify the strategies
Don’t be short of liquidity option
Extensions
Investors redemption / fund performance correlation
Multi period
Define optimal liquidity of the fund (lock up, gates)
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