Pricing of minimum interest guarantees: Is the arbitrage free price fair?
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1 Pricing of minimum interest guarantees: Is the arbitrage free price fair? Pål Lillevold and Dag Svege Pricing of minimum interest guarantees: Is the arbitrage free price fair? 1
2 1 Outline Stating the problem The savings account Case study Discussion Pricing of minimum interest guarantees: Is the arbitrage free price fair? 2
3 2 Stating the problem What is the value to the policyholder of an embedded interest rate guarantee, when it is assumed that the guarantee is priced according to the arbitrage free principle? Probability distributions for the amount on a linked savings account at retirement - respectively with and without a minimum interest rate guarantee embedded. Pricing of minimum interest guarantees: Is the arbitrage free price fair? 3
4 3 The saving account C C C C F T T - 1 T Contributions are made annually in advance. Pricing of minimum interest guarantees: Is the arbitrage free price fair? 4
5 4 Financial market A bond with current value B 0 has a value at time t: B t = B 0 e δt (1) A stock with current value S 0 has a value at time t : where the log-return is L t N S t = S 0 e L t (2) µµ µ σ2 2 t, σ t E[S t ]=S 0 e µt (3). Pricing of minimum interest guarantees: Is the arbitrage free price fair? 5
6 5 Notation µ expected rate of return on the stock σ volatility of the stock δ rate of return of the risk free asset γ minimum interest rate α proportion in the stock - rebalanced C discrete premium payments T time at retirement Pricing of minimum interest guarantees: Is the arbitrage free price fair? 6
7 6 Return The value at time t of a unit invested at time t 1: a t = αe G t +(1 α) e δ (4) G t = L t L t 1 N(µ σ2 2,σ). α (0, 1) is the share/ weight invested in a given stock which develops according to (2) Pricing of minimum interest guarantees: Is the arbitrage free price fair? 7
8 7 The savings account without guarantee F 0 = 0 F t = a t (C + F t 1 ),t=1, 2,...T (5) Pricing of minimum interest guarantees: Is the arbitrage free price fair? 8
9 8 The savings account with guarantee F g t =max{eγ,a t (1 p)} (C + F g t 1 ) (6) Pricing of minimum interest guarantees: Is the arbitrage free price fair? 9
10 9 Guarantee premium p The unit guarantee premium p is obtained as the solution of the equation p = e δ E Q [(e γ (1 p) a t ) + ] = Ke δ Φ( d 2 ) S 0 Φ( d 1 ), Q N d 2 = log(s 0 σ2 K )+(δ 2 ) σ d 1 = d 2 σ K = e γ (1 p) (1 α) e δ S 0 = (1 p) α Ã δ σ2 2,σ! (7) Pricing of minimum interest guarantees: Is the arbitrage free price fair? 10
11 10 F t g - dynamics HF g t-1 + CL g g F t-1 g + C H1 - plhf t-1 + CL g F t-1 t - 1 t Pricing of minimum interest interest guarantee : Is the arbitrage free price fair? 11
12 11 Computation Analytical expressions for F T and F g T distributions? Stochastic Monte Carlo simulation procedure: G t, t {1, 2,...,T} a t, t {1, 2,...,T} F T and F g T (8) Sufficiently large simulated samples will be distributed approximately according to the probability density function (pdf) A measurement of over-performance resulting from guarantee : Ã g! F Ψ T =100 T 1 F T (9) Pricing of minimum interest guarantees: Is the arbitrage free price fair? 12
13 12 Case study µ =10%peryear σ =20%peryear δ = 5 % per year γ = 3 % per year α =20% C =1 T =20years Pricing of minimum interest guarantees: Is the arbitrage free price fair? 13
14 13 p In this case the guarantee premium is p = and the guarantee becomes effective if a t < eγ 1 p = Pricing of minimum interest guarantees: Is the arbitrage free price fair? 14
15 14 Approximate pdfs for F T and F g T Pricing of minimum interest guarantees: Is the arbitrage free price fair? 15
16 15 Approximate pdf for Ψ T Pricing of minimum interest guarantees: Is the arbitrage free price fair? 16
17 16 Risk measures min VaR(.05) CV ar(.05) F T F g T Pricing of minimum interest guarantees: Is the arbitrage free price fair? 17
18 17 Sensitivity of Pr{Ψ T > 0} to changes in the parameters µ and σ σ µ Pricing of minimum interest guarantees: Is the arbitrage free price fair? 18
19 18 Some conclusions The safety the policyholder achieves from an interest rate guarantee is small compared to the reduced return resulting from the guarantee premium: Indeed in our illustrations. Generalizations? Intuition: Too expensive for the policyholder to allow the provider to do away with all risk Non-arbitrage vs. time diversification reconcilable concepts? With high probability similar safety can be achieved by having a slightly smaller proportion in the stock. Pricing of minimum interest guarantees: Is the arbitrage free price fair? 19
20 19 Some observations Long standing tradition for interest rate guarantee in life and pension insurance: Pricing? Asset allocation hedging? Regulators seem to have a positive attitude towards interest rate guarantees in the spirit of consumer protection Is interest rate guarantee a user-friendly concept? Will/should risk interest rate guarantees priced risk-neutral be in demand? Pricing of minimum interest guarantees: Is the arbitrage free price fair? 20
21 20 Appendix: Replicating portfolio Assume we have a stock S t. We want have the possibility to sell the stock at time T for the price K. We can use two investment strategies to achieve this: Buying at put option with strikeprice K. stock and a put option In this case we have the Buying the replicating portfolio. In this case we have a portfolio consisting of the stock and the replicating portfolio. Option pricing and replicating portfolios are in essence two equivalent concepts. Pricing of minimum interest guarantees: Is the arbitrage free price fair? 21
22 21 The two investment strategies Pricing of minimum interest guarantees: Is the arbitrage free price fair? 22
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