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ArcelorMittal Annual Report 2008

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Sensitivity analysis<br />

The following information illustrates the sensitivity to a change in certain assumptions for <strong>ArcelorMittal</strong>’s pension plans<br />

(as of December 31, <strong>2008</strong>, the defined benefit obligation (“DBO”) for pension plans was 9,359):<br />

Effect on 2009 Pre-Tax Pension Expense Effect of December 31,<br />

Change in assumption (sum of service cost and interest cost) <strong>2008</strong> DBO<br />

100 basis point decrease in discount rate 1 973<br />

100 basis point increase in discount rate (3) (818)<br />

100 basis point decrease in rate of compensation (31) (240)<br />

100 basis point increase in rate of compensation 36 264<br />

100 basis point decrease in expected return on plan assets 56 —<br />

100 basis point increase in expected return on plan assets (56) —<br />

The following table illustrates the sensitivity to a change in the discount rate assumption related to <strong>ArcelorMittal</strong>’s OPEB plans<br />

(as of December 31, <strong>2008</strong> the DBO for post-employment benefit plans was 5,254):<br />

Effect on 2009 Pre-Tax OPEB Expense Effect of December 31,<br />

Change in assumption (sum of service cost and interest cost) <strong>2008</strong> DBO<br />

100 basis point decrease in discount rate (7) 580<br />

100 basis point increase in discount rate 6 (464)<br />

100 basis point decrease in healthcare cost trend (36) (441)<br />

100 basis point increase in healthcare cost trend 40 498<br />

The above sensitivities reflect the effect of changing one assumption at a time. Actual economic factors and conditions<br />

often affect multiple assumptions simultaneously, and the effects of changes in key assumptions are not necessarily linear.<br />

Experience adjustments<br />

The two-year history of the present value of the defined benefit obligations, the fair value of the plan assets and the surplus<br />

or the deficit in the pension plans is as follows:<br />

At December 31, At December 31,<br />

(in millions of U.S. dollars) 2007 <strong>2008</strong><br />

Present value of the defined benefit obligations (10,512) (9,359)<br />

Fair value of the plan assets 8,091 5,788<br />

Deficit (2,421) (3,571)<br />

Experience adjustments: (increase)/decrease plan liabilities (195) (122)<br />

Experience adjustments: increase/(decrease) plan assets (201) (1,712)<br />

This table illustrates the present value of the defined benefit obligations, the fair value of the plan assets and the surplus<br />

or the deficit for the OPEB plans is as follows:<br />

At December 31, At December 31,<br />

(in millions of U.S. dollars) 2007 <strong>2008</strong><br />

Present value of the defined benefit obligations (2,805) (5,254)<br />

Fair value of the plan assets 49 635<br />

Deficit (2,756) (4,619)<br />

Experience adjustments: (increase)/decrease plan liabilities (33) (142)<br />

Experience adjustments: increase/(decrease) plan assets — (19)<br />

135<br />

<strong>2008</strong> Consolidated Financial Statements continued<br />

<strong>ArcelorMittal</strong> <strong>Annual</strong> <strong>Report</strong> <strong>2008</strong>

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