Economic Scenario Generators: A Practical Guide
An economic scenario generator (ESG) is a software tool that simulates future paths of economies and financial markets and illuminates the nature of risk
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An economic scenario generator (ESG) enables financial services companies to model future states of the global economy and capital markets for the purposes
What are economic scenario generators?
An Economic Scenario Generator (ESG) refers to a mathematical model (and its computer implementation) that simulates possible future paths of economic and financial market variables.What are scenarios in economics?
Economic scenario planning gives corporate leaders a way to model their businesses for success, despite the uncertain extremes of the current economic moment. It achieves this goal by combining multiple sources of data, including external macroeconomic data sets, econometric modeling, and economic expertise.- The formula for the dynamic mean reversion point has been defined by the NAIC as follows: Mean reversion point = 20% of the median over the last 600 months + 30% of the average over the last 120 months + 50% of the average over the last 36 months The result is then rounded to the nearest 0.25%.
UPDATEONMODELOFFICE
ECONOMICSCENARIO
GENERATOR(ESG)TESTING
2Background
ULSG/VMͲ20
VA/VMͲ21
JasonKehrberg,MAAA,FSA
4AgendaforVMͲ20ModelOfficeUpdate1.
ChangesandNewInfo
2.December2020StochasticReserves
3.ScenarioReserveDistributions
4.SampleScenarioProjections
5.December2019StochasticReserves
6.PreliminaryConclusions
7.Caveats
5VMͲ20ModelOffice- ChangesSince3/3/22
Nootherchangessince3/3/22
6VMͲ20ModelOffice- AdditionalInfo
Usingannualreinvestmentfrequency
7December2020StochasticReserves
ScenarioSet Stochastic
ReserveInitialReserve/$12K
AnnualPremium
AcademyInterestRateGenerator(AIRG) 18,511 154%
ConningOct21Calibration(Unfloored) 39,193 327%
ConningwithGeneralizedFractionalFloor 31,812 265%
StrommenwithShadowRateModelFloor 28,556 238%
ACLIReferenceModelv1.1 31,659 264%
8ScenarioReserveDistributions
tohelpwiththescale 9SampleScenarioProjections
*Only1,000outof10,000scenarioswererunBluelineistheprojectionoftotalassets
10SampleGoodScenario
StartingAssets=
18,511
GPVAD=
Ͳ18,511
ScenarioReserve=
0 thenegativeofstartingassets 11AIRG,WorstScenario
StartingAssets=
18,511
GPVAD=
34,424
ScenarioReserve=
55,935
theGPVAD 12Conning(Unfloored),WorstScenario
StartingAssets=
39,202
GPVAD=
497,663
ScenarioReserve=
536,865
leadstoextremelylargeGPVAD 13Conning(withGFF),WorstScenario
StartingAssets=
31,828
GPVAD=
195,913
ScenarioReserve=
227,741
14Strommen,WorstScenario
StartingAssets=
28,561
GPVAD=
163,055
ScenarioReserve=
191,616
15ACLIReference,WorstScenario
StartingAssets=
31,666
GPVAD=
160,211
ScenarioReserve=
191,877
near0% 16December2019StochasticReserves
ScenarioSet StochasticReserve %Changevs.2020
AcademyInterestRateGenerator(AIRG) 15,200Ͳ17.9%ConningOct21Calibration(Unfloored) TBD N/A
ConningwithGeneralizedFractionalFloor TBD N/A
StrommenwithShadowRateModelFloor TBD N/A
ACLIReferenceModelv1.1 22,786Ͳ28.0%
17PreliminaryConclusions
18Caveats
Notintendedto:
204.SampleScenarioReservecalculations
5.Summaryofresults-allscenariosets
6.Preliminaryconclusions
7.LargeCapEquityFundreturncomparisons
8.Scenarioreservedistributions
9.Preliminarysensitivitytesting
10.Caveats
21VMͲ21ModelOffice- ChangesSince3/3/22
Nootherchangessince3/3/22
22ProductSpecifications
SevenͲyearsurrenderchargeperiod
Singlemodel pointissuedtoage60maleonthevaluationdatewithsinglepremiumof$100,000 23ProductSpecifications
Issueage 60
Singlepremiumatissue $100,000
Fundallocation 80%USlargecapequity/20%USLTCorpbond,rebalancedmonthlyM&Eriskcharges(annlzd.) 1.30%(appliedtofundvalue)
Invmgmtfee(annlzd) 0.75%(halfofthisfeecomesbacktocompanyasguaranteedrevenuesharing)Surrenderchargeperiod 7years
SC%ofdeposit 8,7,6,
5,4,3,2%
GuaranteedBenefits GLWB GMDB
BenefitBaseRollup%5%5%
Rollupperiod 10years Uptoage80
Ratchetorreset No No
WithdrawalsProͲrata
1ProͲrata
Ridercharge(annlzd.) 1.20% 0.30%
GLWBwithdrawalrate%
AttainedAge59Ͳ64 4.00%
AttainedAge65Ͳ74 5.00%
AttainedAge75Ͳ79 5.25%
AttainedAge80+ 5.50%
fordollarasWD'saretakenVariableAnnuityBasecontract
24LiabilityAssumptions
Mortality2012IAM,improvementscaleG2,VMͲ21ASPAFx factorsAssumed100%ofmaximumGLWBwithdrawalpercentage(appliedtomaxofEoY 10fundvalueorbenefitbase)istakenaslifetimeincomeamountatyear10election
Bothoftheabove(timingandamount)aremoreconservativethanprescribedandindustryexperienceandwereassumedforinitial modelingconvenienceandtimeconstraints
25AssetAssumptions
9basispoints(bp)annualinvestmentexpense
liabilitycashflows10,000scenarioswererunforeachscenarioset
26VMͲ21ReserveMethodDescription
ScenarioReserve forthismodelsegment=Max(aggregatecashsurrendervalue(CSV),StartingAssets+GreatestPresentValueofAccumulatedDeficiencies(GPVAD))
thescenarioGPVAD(NAER)
27SampleScenarioReserveCalculations
Beforediscussingthefullscenario
setresults,itisusefultoreviewthe mechanicsandkeyamountsofthe scenarioreservecalculation.Thenext3slidesdiscussandshow
graphsofthisdetailfor2ofthe3,000scenarioreservescomprising
theCTE70stochasticreserve.Scenario8025
$134,593Scenario8025
reserve= $134,593Scenario3267Scenario3267
reserve= $93,804 28SampleScenarioReserveCalculations
Greenline istheseparateaccountassets(fundvalue);startsatdepositandgrowsordeclinesbasedonscenariofundreturnsnetoffees,andasfundvalueisreleasedonsurrender,deathandGLWBwithdrawalpaymentswhilefundvalueispositive
Blueline isthegeneralaccountassets/deficienciespriortothescenarioreserveassetsaddedin.Startsnegative(initialSASCborrowing)andgrowsinearlyyearsasfeeincomeisinvested(netofexpensesandsomeGMDBandGLWBclaimsinexcess
offundvaluereleased).ThendeclinesafterseparateaccountfundvalueexhaustsandcontinuingGMDB+GLWBclaims and
oftheCTE70scenarios.Orangeline isthePVofthebluelineassetsanddeficiencies,discountedatthenetearnedratesonadditionalassets(NAER).ThegreatestoftheprojectedyearͲendPVofnegativeofthedeficiencies(GPVAD)isthescenarioreserveneededtobe
Yellowline isthenewprojectionofthebluelinegeneralaccountassetsbutnowincludingtheinitialscenarioreserveassetsandshowstheprojectedyearͲenddeficiencieshavebeeneliminated.
29HighReserveScenario
annzld cumNAER largecap LTcorp fundvalueGPVAD equityfund bondfund wtdavgdiscrate1year 4.65%Ͳ7.33% 2.36% 2.57%
5yearsͲ0.57% 1.48% 0.15% 2.61%
10yearsͲ12.13% 0.54%Ͳ9.44% 2.65%
15yearsͲ7.53% 1.22%Ͳ6.45% 2.68%
20yearsͲ4.55% 1.84%Ͳ4.88% 2.73%
30yearsͲ6.54% 2.22%Ͳ3.28% 2.91%
40yearsͲ4.01% 3.18%Ͳ2.47% 3.75%
basedonscenariowealthratiosSummary:
andrepaymentofinitialSASCborrowing •Totalscenarioreserve=$134,593 GPVAD $41,793 30LowReserveScenario
Summary:
andrepaymentofinitialSASCborrowing •Totalscenarioreserve=$93,804 annzld cumNAER largecap LTcorp fundvalueGPVAD equityfund bondfund wtdavgdiscrate1yearͲ6.65%Ͳ13.89%Ͳ8.03% 2.57%
5years 0.30% 2.11% 0.88% 2.62%
10years 2.38% 3.69% 2.84% 2.69%
15years 4.29% 2.96% 4.25% 2.72%
20yearsͲ0.25% 1.13% 0.61% 2.68%
30years 1.97% 2.55% 0.41% 2.69%
40years 2.71% 1.73% 0.31% 2.72%
basedonscenariowealthratios GPVAD $1,004 deathbenefitsandexpenses. 31SummaryofResults-AllScenarioSets
Thenext2slidessummarizethe:
•StochasticCTE70reservesand •C3Phase2TotalAssetsRequired(TAR)Forthefollowingscenariosetstested:
1. AIRGscenarios
2. ACLIreferenceSLVmodel(version1)
3. ConningGEMSwithGeneralizedFractionalFloor(GFF)
4. StrommenwithShadowRateFloor(version4B)
5. ConningGEMSunfloored12/31/2020valuationdatescenariosdevelopedin
October2021
theequityrisk 32SummaryofResultsͲCTE70Reserves
CTE70ReserveRatioto
CSV12/31/2020
CTE70ReserveRatioto
CSV 1 AcademyInterestRateGenerator(AIRG) 95,854 103.3% 98,491 106.1% 2 ACLIReferenceModelV1.0 96,146 103.6% 98,515 106.2% 3 ConningwithGeneralizedFractionalFloor TBD 107,860 116.2% 4 StrommenwithShadowRateModelFloor TBD 108,971 117.4% 5 ConningOct21Calibration(Unfloored) TBD 110,825 119.4%3hybrid
ConningwithGFF,usingAIRGequityscens 97,406 105.0%
4hybrid
StrommenwithSRF,usingAIRGequityscens
5hybrid
ConningOct21unfl,usingAIRGequityscens
Reserves(gen.acct.resvisexcessoverCSV)
33SummaryofResults-C3P2TAR
C3P2TARRatioto
CSV12/31/2020
C3P2TARRatioto
CSV 1 AcademyInterestRateGenerator(AIRG) 99,268 107.0% 103,082 111.1% 2 ACLIReferenceModelV1.0 99,769 107.5% 103,202 111.2% 3 ConningwithGeneralizedFractionalFloor TBD 113,470 122.3% 4 StrommenwithShadowRateModelFloor TBD 114,226 123.1% 5 ConningOct21Calibration(Unfloored) TBD 116,209 125.2%3hybrid
ConningwithGFF,usingAIRGequityscens 101,811 109.7%4hybrid
StrommenwithSRF,usingAIRGequityscens
5hybrid
ConningOct21unfl,usingAIRGequityscens
C3P2TAR
34PreliminaryConclusions
Impacttoreservesisverylargeunderthe3ConningESGscenariosets(Octunfloored,GFF,StrommenSRF)relativetocurrent AIRGorACLIreferencemodel
havethislinkage.SpecificallytheGEMSLargeCapexpectedequityreturnisroughlytheOvernightRateplusafixedERP. Thelinkhappensateverynodeofthesimulation,sotheshortͲtermexpectedequityreturnisconstantlychanging.EarlyyearverylowandnegativeOvernightsimulatedratescanmateriallyreducethesimulatedequityreturns. As
theaverageyieldsriseinthesescenarios,therewillbeageneralriseintheaverageLargeCapreturn,buttheoverallimpactcumulativeappearstobe lowerreturnsasshownonslide36 which compareslefttailequityreturnsacrossthesets(lefttailmorerelevantforthisparticularproduct).
35PreliminaryConclusions
to returns) 36ComparisonofEquityScenarios
5years 10years 15years 20years 30years 5years 10years 15years 20years 30years 5years 10years 15years 20years 30years
percentile50.00% 5.28% 5.45% 5.65% 5.81% 6.08% 7.70% 7.75% 7.65% 7.66% 7.59%Ͳ2.42%Ͳ2.30%Ͳ1.99%Ͳ1.85%Ͳ1.50%
10.00%Ͳ4.22%Ͳ1.85%Ͳ0.58% 0.24% 1.36%Ͳ1.53% 1.12% 2.35% 2.98% 3.84%Ͳ2.69%Ͳ2.97%Ͳ2.92%Ͳ2.74%Ͳ2.48%
5.00%Ͳ7.44%Ͳ4.41%Ͳ2.61%Ͳ1.52%Ͳ0.14%Ͳ4.35%Ͳ0.87% 0.65% 1.74% 2.81%Ͳ3.10%Ͳ3.54%Ͳ3.26%Ͳ3.25%Ͳ2.95%
2.34%Ͳ0.65% 0.58% 1.82%Ͳ3.72%Ͳ4.68%Ͳ3.57%Ͳ3.62%Ͳ3.18%
0.50%Ͳ16.64%Ͳ11.80%Ͳ8.38%Ͳ5.95%Ͳ3.84%Ͳ11.10%Ͳ5.23%Ͳ2.90%Ͳ1.41% 0.00%Ͳ5.54%Ͳ6.56%Ͳ5.48%Ͳ4.54%Ͳ3.84%
mean 5.74% 6.38% 6.88% 7.28% 8.03% 8.73% 8.83% 8.82% 8.82% 8.81%Ͳ2.99%Ͳ2.44%Ͳ1.94%Ͳ1.53%Ͳ0.78%
50.00% 5.18% 5.11% 5.22% 5.37% 5.64% 7.70% 7.75% 7.65% 7.66% 7.59%Ͳ2.52%Ͳ2.64%Ͳ2.43%Ͳ2.29%Ͳ1.95%
10.00%Ͳ4.21%Ͳ1.99%Ͳ
0.86% 0.13% 1.16%Ͳ1.53% 1.12% 2.35% 2.98% 3.84%Ͳ2.69%Ͳ3.11%Ͳ3.21%Ͳ2.85%Ͳ2.68%
5.00%Ͳ7.58%Ͳ4.55%Ͳ2.67%Ͳ1.67%Ͳ0.24%Ͳ4.35%Ͳ0.87% 0.65% 1.74% 2.81%Ͳ3.23%Ͳ3.68%Ͳ3.33%Ͳ3.40%Ͳ3.05%
2.50%Ͳ10.23%Ͳ7.01%Ͳ4.40%Ͳ3.24%Ͳ1.49%Ͳ6.74%Ͳ2.34%Ͳ0.65% 0.58% 1.82%Ͳ3.49%Ͳ4.67%Ͳ3.75%Ͳ3.82%Ͳ3.30%
0.50%Ͳ16.84%Ͳ11.55%Ͳ8.83%Ͳ5.98%Ͳ4.07%Ͳ11.10%Ͳ5.23%Ͳ2.90%Ͳ1.41% 0.00%Ͳ5.74%Ͳ6.32%Ͳ5.93%Ͳ4.57%Ͳ4.07%
minͲ33.40%Ͳ23.68%Ͳ18.42%mean 5.59% 5.89% 6.19% 6.47% 7.02% 8.73% 8.83% 8.82% 8.82% 8.81%Ͳ3.14%Ͳ2.94%Ͳ2.63%Ͳ2.35%Ͳ1.78%
50.00% 5.49% 5.18% 5.20% 5.26% 5.47% 7.70% 7.75% 7.65% 7.66% 7.59%Ͳ2.21%Ͳ2.57%Ͳ2.45%Ͳ2.40%Ͳ2.12%
10.00%Ͳ4.25%Ͳ2.30%Ͳ1.33%Ͳ0.66% 0.30%Ͳ1.53% 1.12% 2.35% 2.98% 3.84%Ͳ2.72%Ͳ3.42%Ͳ3.68%Ͳ3.64%Ͳ3.54%
5.00%Ͳ7.42%Ͳ4.99%Ͳ3.33%Ͳ2.47%Ͳ1.22%Ͳ4.35%Ͳ0.87% 0.65% 1.74% 2.81%Ͳ3.07%Ͳ4.12%Ͳ3.98%Ͳ4.21%Ͳ4.04%
Ͳ2.47%Ͳ6.74%Ͳ2.34%Ͳ0.65% 0.58% 1.82%Ͳ3.78%Ͳ5.23%Ͳ4.61%Ͳ4.56%Ͳ4.28%0.50%Ͳ16.42%Ͳ12.08%Ͳ9.44%Ͳ7.20%Ͳ5.12%Ͳ11.10%Ͳ5.23%Ͳ2.90%Ͳ1.41% 0.00%Ͳ5.31%Ͳ6.85%Ͳ6.55%Ͳ5.79%Ͳ5.12%
mean 6.00% 6.29% 6.66% 7.03% 7.81% 8.73% 8.83% 8.82% 8.82% 8.81%Ͳ2.73%Ͳ2.53%Ͳ2.16%Ͳ1.79%Ͳ1.00%ConningGEMSGFFminusAIRG
Strommen4B
minusAIRG ConningGEMSOct21unflooredminusAIRGConningGEMSwithGFF12/31/2020 AIRG12/31/2020(sameas12/31/2019) Strommen4BwithSRF12/31/2020 AIRG12/31/2020(sameas12/31/2019) ConningGEMSOct21unfloored12/31/2020 AIRG12/31/2020(sameas12/31/2019) 37ScenarioReserveDistributions
38PreliminarySensitivityTests
EoY40 annualized EoY40 annualized
accumulated NAERdiscrate accumulated NAERdiscrateSensitivityTestsforonescenario
deficiency GPVAD over40years deficiency GPVAD over40years1 ConningGFFscenario#8025(basecase)(182,096)41,7933.75%
2 +25bpparallelshiftupallUSTrates(187,776)38,9334.00% (5,680)(2,861)0.25%
3Ͳ25bpparallelshiftdownallUSTrates(176,485)44,8613.49% 5,6113,068 Ͳ0.25%
4+25bphigherequityfundtotalreturns(80%alloc)(180,449)41,4153.75% 1,647(378)0.00%
5 +25bprate
shiftand+25bpequityreturns(186,006)38,5664.00% (3,910)(3,228)0.25%Initialcomments:
2 Accumulateddeficiencyisworsewhenratesarehigherduetohigherborrowingcosts,butGPVAD(generalaccountreserve)islower.
ongoing3 Accumulateddeficiencyislesswhenratesarelowerduetolowerborrowingcosts,but
GPVAD(generalaccountreserve)ishigher.
2&3 ThusthereserveimpactisslighltyasymmetricforUSTsensitivity($3,068higherreservefortest3versus$2,861lowerreservefortest2).
4 RelativelylowfavorableimpactofthehigherequityreturnsforthisscenarioͲseparateaccountstilldeclinesquicklytozeroevenafter
5 Combinedimpactisclosetosumofthe
partstests2+4. 39Caveats
Notintendedto:
40Questions?
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