From Ruin Theory to Solvency in NonLife Insurance


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1 From Ruin Theory to Solvency in NonLife Insurance Mario V. Wüthrich RiskLab ETH Zurich & Swiss Finance Institute SFI January 23, 2014 LUH Colloquium Versicherungs und Finanzmathematik Leibniz Universität Hannover
2 Aim of this presentation We start from Lundberg s thesis (1903) on ruin theory and modify his model step by step until we arrive at today s solvency considerations surplus process 1
3 CramérLundberg model Consider the surplus process (C t ) t 0 given by where L t = N t i=1 c 0 0 π > 0 Y i 0 C t = c 0 + πt N t i=1 initial capital, premium rate, Y i, Harald Cramér homogeneous compound Poisson claims process, satisfying the net profit condition (NPC): π > E[L 1 ]. 2
4 Ultimate ruin probability The ultimate ruin probability for initial capital c 0 0 is given by [ ] [ ] ψ(c 0 ) = P inf C t < 0 t R + C 0 = c 0 = P c0 inf C t < 0, t R + i.e. this is the infinite time horizon ruin probability. 10 Under (NPC): ψ(c 0 ) < 1 for all c surplus process 3
5 Lundberg s exponential bound Assume (NPC) and that the Lundberg coefficient γ > 0 exists. Then, we have exponential bound ψ(c 0 ) exp{ γc 0 }, for all c 0 0 (large deviation principle (LDP)). This is the lighttailed case, i.e. for the existence of γ > 0 we need exponentially decaying survival probabilities of the claim sizes Y i, because we require E[exp{γY i }] <. Filip Lundberg 4
6 Subexponential case Von Bahr, Veraverbeke, Embrechts investigate the heavytailed case. In particular, for Y i i.i.d. Pareto(α > 1) and (NPC): ψ(c 0 ) const c α+1 0 as c 0. Heavytailed case provides a much slower decay Paul Embrechts gamma surplus process Pareto surplus process 5
7 Discrete time ruin considerations 10 Insurance companies cannot continuously control their surplus processes (C t ) t gamma surplus process They close their books and check their surplus on a yearly time grid. Consider the discrete time ruin probability [ ] [ ] P c0 inf C n < 0 P c0 inf C t < 0 n N 0 t R + = ψ(c 0 ). This leads to the study of the random walk (C n c 0 ) n N0 for (discrete time) accounting years n N 0. 6
8 Oneperiod ruin problem Insured buy oneyear nonlife insurance contracts: why bother about ultimate ruin probabilities? gamma surplus process Moreover, initial capital c 0 0 needs to be readjusted every accounting year. Consider the (discrete time) oneyear ruin probability [ ] [ ] P c0 [C 1 < 0] P c0 inf C n < 0 P c0 inf C t < 0 n N 0 t R + = ψ(c 0 ). This leads to the study of the surplus C 1 = c 0 + π N 1 i=1 Y i at time 1. 7
9 Oneperiod problem and real world considerations Why do we study so complex models when the real world problem is so simple? gamma surplus process Total asset value at time 1: A 1 = c 0 + π. Total liabilities at time 1: L 1 = N 1 i=1 Y i. C 1 = c 0 + π N 1 i=1 Y i = A 1 L 1??? 0. (1) There are many modeling issues hidden in (1)! We discuss them step by step. 8
10 ValueatRisk (VaR) risk measure C 1 = A 1 L 1??? 0. ValueatRisk on confidence level p = 99.5% (Solvency II): choose c 0 minimal such that P c0 [C 1 0] = P [A 1 L 1 ] = P [L 1 c 0 π 0] p. Freddy Delbaen Choose other (normalized) risk measures ϱ : M L 1 (Ω, F, P) R and study ϱ(l 1 A 1 ) = ϱ (L 1 c 0 π)??? 0, where implies SOLVENCY w.r.t. risk measure ϱ. 9
11 Asset return and financial risk (1/2) Initial capital at time 0: c 0 0. Premium received at time 0 for accounting year 1: π > 0. Total asset value at time 0: a 0 = c 0 + π > 0. This asset value a 0 is invested in different assets k {1,..., K} at time 0. asset classes cash and cash equivalents debt securities (bonds, loans, mortgages) real estate & property equity, private equity derivatives & hedge funds insurance & reinsurance assets other assets 10
12 Asset return and financial risk (2/2) Choose an asset portfolio x = (x 1,..., x K ) R K at time 0 with initial value a 0 = K k=1 x k S (k) 0, where S (k) t is the price of asset k at time t. This provides value at time 1 A 1 = K k=1 x k S (k) 1 = a 0 (1 + w R 1 ), for buy & hold asset strategy w = w(x) R K and (random) return vector R 1. ϱ(l 1 A 1 ) = ϱ (L 1 a 0 (1 + w R 1 ))??? 0. where implies solvency w.r.t. risk measure ϱ and business plan (L 1, a 0, w). 11
13 Insurance claim (liability) modeling (1/2) MAIN ISSUE: modeling of insurance claim L 1 = N 1 i=1 Y i. Insurance claims are neither known nor can immediately be settled at occurrence! premium π accident date reporting date claims closing insurance period (accounting year 1) claims cash flows X = ( X 1, X 2, ) time Insurance claims of accounting year 1 generate insurance liability cash flow X: X = (X 1, X 2,...) with X t being the payment in accounting year t. Question: How is the cash flow X related to the insurance claim L 1? 12
14 Insurance claim (liability) modeling (2/2) premium π accident date reporting date claims closing insurance period (accounting year 1) claims cash flows X = ( X 1, X 2, ) time Main tasks: cash flow X = (X 1, X 2,...) modeling, cash flow X = (X 1, X 2,...) prediction, cash flow X = (X 1, X 2,...) valuation, using all available relevant information: exactly here the oneperiod problem turns into a multiperiod problem. 13
15 Bestestimate reserves Choose a filtered probability space (Ω, F, P, F) with filtration F = (F t ) t N0 and assume cash flow X is Fadapted. 1st attempt to define L 1 (interpretation of Solvency II): L 1 = X 1 + s 2 P (1, s) E [X s F 1 ], where E [X s F 1 ] is the bestestimate reserve (prediction) of X s at time 1; P (1, s) is the zerocoupon bond price at time 1 for maturity date s. Note that L 1 is F 1 measurable, i.e. observable w.r.t. F 1 (information at time 1). 14
16 1st attempt to define L 1 L 1 = X 1 + s 2 P (1, s) E [X s F 1 ]. (2) Issue: Solvency II asks for economic balance sheet, but L 1 is not an economic value. (a) Risk margin is missing: any riskaverse risk bearer asks for such a (profit) margin. (b) Zerocoupon bond prices and claims cash flows X s, s 2, may be influenced by the same risk factors and, thus, there is no decoupling such as (2). 15
17 2nd attempt to define L 1 Choose an appropriate stateprice deflator ϕ = (ϕ t ) t 1 and L 1 = X 1 + s 2 1 ϕ 1 E [ϕ s X s F 1 ]. ϕ = (ϕ t ) t 1 is a strictly positive, a.s., and Fadapted. ϕ = (ϕ t ) t 1 reflects price formation at financial markets, in particular, P (1, s) = 1 ϕ 1 E [ϕ s F 1 ]. Hans Bühlmann If ϕ s and X s are positively correlated, given F 1, then L 1 X 1 + s 2 P (1, s) E [X s F 1 ]. 16
18 Solvency at time 0 Choose a filtered probability space (Ω, F, P, F) such that it caries the random vectors ϕ (stateprice deflator), R 1 (returns of assets) and X (insurance liability cash flows) in a reasonable way. The business plan (X, a 0, w) is solvent w.r.t. the risk measure ϱ and stateprice deflator ϕ if ϱ(l 1 A 1 ) = ϱ X 1 + s 2 1 E [ϕ s X s F 1 ] a 0 (1 + w R 1 ) 0. ϕ 1 Thus, it is likely (measured by ϱ and ϕ) that the liabilities L 1 are covered by assets A 1 at time 1 in an economic balance sheet. 17
19 Acceptability arbitrage The choice of the stateprice deflator ϕ and the risk measure ϱ cannot be done independently of each other: ϕ describes the risk reward; ϱ describes the risk punishment. Assume there exist acceptable zerocost portfolios Y with E[ϕ Y] = 0 and ϱ Y 1 + s 2 1 E [ϕ s Y s F 1 ] < 0. ϕ 1 P. Artzner Then, unacceptable positions can be turned into acceptable ones just by loading on more risk = acceptability arbitrage. Reasonable solvency models (ϕ, ϱ) should exclude acceptability arbitrage, see Artzner, Delbaen, Eisele, KochMedina. 18
20 Asset & liability management (ALM) The business plan (X, a 0, w) is solvent w.r.t. risk measure ϱ and stateprice deflator ϕ if ϱ(l 1 A 1 ) = ϱ X 1 + s 2 1 ( E [ϕ s X s F 1 ] a w ) R 1 0. ϕ 1 ALM optimize this business plan (X, a 0, w): Which asset strategy w R K minimizes the capital a 0 = c 0 + π and we still remain solvent? This is a nontrivial optimization problem. Of course, we need to exclude acceptability arbitrage, which may also provide restrictions on the possible asset strategies w = eligible assets. 19
21 Summary of modeling tasks Provide reasonable stochastic models for R 1, X and ϕ (yield curve extrapolation). What is a reasonable profit margin for risk bearing expressed by ϕ? Which risk measure(s) ϱ should be preferred? ( Noacceptability arbitrage!) Modeling is often split into different risk modules: (financial) market risk insurance risk (underwriting and reserve risks) credit risk operational risk Issue: dependence modeling and aggregation of risk modules. Aggregation over different accounting years and lines of business? 20
22 Dynamic considerations Are we happy with the above considerations? Not entirely! Liability runoff is a multiperiod problem: We also want sensible dynamic behavior. This leads to the consideration of multiperiod problems and supermartingales. 21
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