Document:

<PAGE>

                                                                    EXHIBIT 10.6

                      INVESTMENT ADMINISTRATION AGREEMENT

     THIS INVESTMENT ADMINISTRATION AGREEMENT (this "Agreement"), effective as
of August 13, 1998, is made by and between FAIRFAX FINANCIAL HOLDINGS LIMITED
and CRUM AND FORSTER INSURANCE COMPANY. As used in this Agreement, "we", "us",
and "our" shall refer to CRUM AND FORSTER INSURANCE COMPANY, and "you" and
"your" shall refer to FAIRFAX FINANCIAL HOLDINGS LIMITED.

     In consideration of the mutual promises contained herein, the parties agree
as follows:

     1.    We authorize you to provide, and by signing below you agree to
           provide, the investment administration services set forth in Schedule
           A attached hereto, on our behalf and on the terms and conditions set
           out in this Agreement, subject to such guidelines, procedures and
           limitations as may be duly established and approved by our Board of
           Directors or a duly authorized committee of said Board.

     2.    You shall be entitled to such fees, payable quarterly in arrears, for
           the service provided hereunder, as you may specify from time to time.
           Attached hereto as Schedule B is a copy of your current fee schedule
           and you agree to give us thirty (30) days prior written notice of any
           change in such schedule, which change shall require the approval of
           the Department of Banking and Insurance ("Department"). Such fees
           shall be the exclusive fees and charges payable (excluding third
           party disbursements reasonably incurred) for the services provided
           hereunder. As regards third party services, you will charge us only
           the amount of your actual disbursements paid to third parties for
           such services. We will remit payment to you not later than 15 days
           following delivery to us of a report showing the amount due
           hereunder.

     3.    Either party hereto may terminate this Agreement without penalty by
           giving the other party at least thirty (30) days advance written
           notice of its desire to terminate the same.

     4.    This Agreement shall enure to the benefit of and shall be binding
           upon the parties hereto and their respective successors. This
           Agreement may not be assigned by either party.

     5.    You and we each acknowledge that the terms of this Agreement are the
           exclusive and conclusive terms of our mutual agreement with regard to
           the subject matter hereof.

     6.    Any dispute or difference arising with reference to the applicable
           interpretation or effect of this Agreement, or any part thereof,
           shall be referred to a Board of Arbitration (the "Board") of two (2)
           arbitrators and an umpire.

        The members of the Board shall be active or retired disinterested
        officers of insurance or reinsurance companies.

        One arbitrator shall be chosen by the party initiating the arbitration
        and designated in the letter requesting arbitration. The other party
        shall respond, within thirty (30) days, advising of its arbitrator. The
        umpire shall thereafter be chosen by two (2) arbitrators. In the event
        either party fails to designate its arbitrator as indicated above, the
        other party is hereby authorized and empowered to name the second
        arbitrator, and the party which failed to designate its arbitrator shall
        be deemed to have waived its rights to designate an arbitrator and shall
        not be aggrieved thereby. The two (2) arbitrators shall then have thirty
        (30) days within which to choose an umpire. If they are unable to do so
        within thirty (30) days following their appointment, the umpire shall be
        chosen by the manager of the American Arbitration Association and such
        umpire shall be a person who is an active or retired disinterested
        officer of an insurance or reinsurance company. In the event of the
        death, disability or incapacity of an arbitrator or the umpire, a
        replacement shall be named pursuant to the process which resulted in the
        selection of the arbitrator or umpire to be replaced.

        Each party shall submit its case to the Board within one (1) month from
        the date of the appointment of the umpire, but this period of time may
        be extended by unanimous written consent to the Board.
<PAGE>

        The sittings of the Board shall take place in Morristown, New Jersey.
        The Board shall make its decision with regards to the custom and usage
        of the insurance and reinsurance business. The Board is released from
        all judicial formalities and may abstain from the strict rules of law.
        The written decision of a majority of the Board shall be rendered within
        sixty (60) days following the termination of the Board's hearings,
        unless the parties consent to an extension. Such majority decision of
        the Board shall be final and binding upon the parties both as to law and
        fact, and may not be appealed to any court of any jurisdiction. Judgment
        may be entered upon the final decision of the Board in any court of
        proper jurisdiction.

     7.    The provisions in Schedule A and Schedule B attached hereto are
           hereby incorporated into, and form part of, this Agreement.

     8.    This Agreement, including the schedules attached hereto and made a
           part hereof, may only be amended by written agreement signed by the
           parties after the amendment has received the prior approval of the
           Department.

     9.    Unless otherwise specified herein, all notices, instructions, advices
           or other matters covered or contemplated by this Agreement, shall be
           deemed duly given when received in writing (including by fax or other
           similar form of transmission) by you or us, as applicable, at the
           address or fax number first above written or such other address or
           fax number as shall be specified in a notice similarly given:

           If to us:

       Chief Financial Officer
        Crum and Forster Insurance Company
        305 Madison Avenue
        Morristown, New Jersey 07960
        Telecopy Number 973/490-6612

           If to you:

       FAIRFAX FINANCIAL HOLDINGS LIMITED
        95 Wellington Street West
        Suite 800
        Toronto, Ontario
        M5J 2N7
        Fax No.: (416) 367-2201

        Any such notice or communication shall be deemed to have been received
        by any such party if delivered, on the date of delivery, or if sent by
        prepaid registered mail on the fourth business day following mailing
        thereof to the party to whom addressed. For such purpose, no day during
        which there shall be a strike or other occurrence interfering with
        normal mail service shall be considered a business day.

     10.   This Agreement shall be governed and construed in accordance with the
           laws of the State of New Jersey, our state of domicile. Each of the
           parties hereto submits to the jurisdiction of the state and federal
           courts of the State of New Jersey, in any action or proceeding
           arising out of or relating to this Agreement and all claims in
           respect of any such action or proceeding may be heard or determined
           in any such court; and service of process, notices and demands of
           such courts may be made upon any party by personal service to
           LeBoeuf, Lamb, Greene & MacRae, L.L.P., 125 West 55th Street, New
           York, New York 10019 or by mailing copies of such process, notices
           and demands by certified or registered mail to such address (such
           address being automatically changed to the principal office from time
           to time of LeBoeuf, Lamb Greene & MacRae, L.L.P. in New York, New
           York).

     11.   You and we and the duly authorized representatives of each of us
           shall, at all reasonable times, each be permitted access to all
           relevant books and records of the other pertaining to this Agreement.
           You and your duly authorized representatives shall provide to the
           Department, within fifteen (15) days of any
<PAGE>

           request from the Department therefor, copies of all your books and
           records as they pertain to us (or any portion thereof as may be
           specifically requested).

     IN WITNESS WHEREOF, this Agreement is hereby executed by duly authorized
officers of the parties hereto as of the date first written above.

                                          CRUM AND FORSTER INSURANCE COMPANY

                                          By:  /s/ DENNIS J. HAMMER
                                            ------------------------------------
                                            Authorized Signature

                                            Dennis J. Hammer
                                            ------------------------------------
                                            Name of Authorized Signatory

                                          By:  /s/ VALERIE GASPARIK
                                            ------------------------------------
                                            Authorized Signature

                                            Valerie Gasparik
                                            ------------------------------------
                                            Name of Authorized Signatory

                                          FAIRFAX FINANCIAL HOLDINGS LIMITED

                                          By:  /s/ BRADLEY P. MARTIN
                                            ------------------------------------
                                            Authorized Signature

                                            Bradley P. Martin
                                            ------------------------------------
                                            Name of Authorized Signatory
<PAGE>

                                   SCHEDULE A

                                    SERVICES

     Tasks underlying the fees to be performed by Fairfax Financial Holdings
Limited are:

MONTHLY

--  computation of all regulatory figures

--  analysis and reconciliation of portfolios

--  yield review

--  computation of market decline tests

--  computation of liquidity analysis

--  analysis of bookvalues, e.g. bond amortizations and investment provisions

--  analysis of gross gain and loss positions

--  cash flow obligations

--  investment review meeting

PERIODIC

--  review and analysis of foreign exchange position

--  placement of foreign exchange contracts, where appropriate

--  discussions with regulators regarding portfolio (positions)

--  reporting to the Board of Directors of Crum and Forster Insurance Company

--  reporting to the investment committee

--  reporting to the audit committee

--  general assistance with accounting issues

--  maintaining contact with external auditors

--  such other administrative services as the parties shall mutually agree from
    time to time
<PAGE>

                                   SCHEDULE B

                                  FEE SCHEDULE

     Fees will be calculated at the end of each calendar quarter based upon the
average of the market value of the funds held in the investment account (the
"Account") governed by the terms of the Investment Management Agreement between
Crum and Forster Insurance Company and Hamblin Wasta Investment Counsel, Ltd.,
dated as of August 13, 1998 at the close of business for the three (3) preceding
months. Charges are stated on a calendar year basis.

<Table>
<Caption>
MARKET VALUE                                                    CHARGE
------------                                                    ------
<S>                                                             <C>
On Total Market Value.......................................     .10%
</Table>

     In the event that the day upon which this Agreement is terminated is a day
other than the first day of a calendar quarter, the fees payable for such
quarter shall be pro-rated and shall be determined having regard to the market
value of the Account based upon the most recent financial report which has been
delivered to Crum and Forster Insurance Company by the Custodian for the
Account.<PAGE>

                                                                    EXHIBIT 10.7

                      INVESTMENT ADMINISTRATION AGREEMENT

     THIS INVESTMENT ADMINISTRATION AGREEMENT (this "Agreement"), dated as of
August 13, 1998, is made by and between FAIRFAX FINANCIAL HOLDINGS LIMITED and
CRUM & FORSTER INDEMNITY COMPANY. As used in this Agreement, "we", "us", and
"our" shall refer to CRUM & FORSTER INDEMNITY COMPANY, and "you" and "your"
shall refer to FAIRFAX FINANCIAL HOLDINGS LIMITED.

     In consideration of the mutual promises contained herein, the parties agree
as follows:

     1.    We authorize you to provide, and by signing below you agree to
           provide, the investment administration services set forth in Schedule
           A attached hereto, on our behalf and on the terms and conditions set
           out in this Agreement, subject to such guidelines, procedures and
           limitations as may be duly established and approved by our Board of
           Directors or a duly authorized committee of said Board.

     2.    You shall be entitled to such fees, payable quarterly in arrears, for
           the service provided hereunder, as you may specify from time to time.
           Attached hereto as Schedule B is a copy of your current fee schedule
           and you agree to give us thirty (30) days prior written notice of any
           change in such schedule, which change shall require the approval of
           the Department of Insurance ("Department"). Such fees shall be the
           exclusive fees and charges payable (excluding third party
           disbursements reasonably incurred) for the services provided
           hereunder. As regards third party services, you will charge us only
           the amount of your actual disbursements paid to third parties for
           such services. We will remit payment to you not later than 15 days
           following delivery to us of a report showing the amount due
           hereunder.

     3.    Either party hereto may terminate this Agreement without penalty by
           giving the other party at least thirty (30) days advance written
           notice of its desire to terminate the same.

     4.    This Agreement shall enure to the benefit of and shall be binding
           upon the parties hereto and their respective successors. This
           Agreement may not be assigned by either party.

     5.    You and we each acknowledge that the terms of this Agreement are the
           exclusive and conclusive terms of our mutual agreement with regard to
           the subject matter hereof.

     6.    Any dispute or difference arising with reference to the applicable
           interpretation or effect of this Agreement, or any part thereof,
           shall be referred to a Board of Arbitration (the "Board") of two (2)
           arbitrators and an umpire.

       The members of the Board shall be active or retired disinterested
       officers of insurance or reinsurance companies.

       One arbitrator shall be chosen by the party initiating the arbitration
       and designated in the letter requesting arbitration. The other party
       shall respond, within fifteen (15) days, advising of its arbitrator. The
       umpire shall thereafter be chosen by two (2) arbitrators. In the event
       either party fails to designate its arbitrator as indicated above, the
       other party is hereby authorized and empowered to name the second
       arbitrator, and the party which failed to designate its arbitrator shall
       be deemed to have waived its rights to designate an arbitrator and shall
       not be aggrieved thereby. The two (2) arbitrators shall then have thirty
       (30) days within which to choose an umpire. If they are unable to do so
       within thirty (30) days following their appointment, each arbitrator
       shall nominate three candidates within ten (10) days thereafter, two of
       whom the other shall decline, and the decision shall be made by drawing
       lots. In the event of the death, disability or incapacity of an
       arbitrator or the umpire, a replacement shall be named pursuant to the
       process which resulted in the selection of the arbitrator or umpire to be
       replaced.

       Each party shall submit its case to the Board within one (1) month from
       the date of the appointment of the umpire, but this period of time may be
       extended by unanimous written consent to the Board.

       The sittings of the Board shall take place in New York, New York. The
       Board shall make its decision with regards to the custom and usage of the
       insurance and reinsurance business. The Board is released from all
       judicial formalities and may abstain from the strict rules of law. The
       written decision of a
<PAGE>

       majority of the Board shall be rendered within sixty (60) days following
       the termination of the Board's hearings, unless the parties consent to an
       extension. Such majority decision of the Board shall be final and binding
       upon the parties both as to law and fact, and may not be appealed to any
       court of any jurisdiction. Judgment may be entered upon the final
       decision of the Board in any court of proper jurisdiction.

     7.    The provisions in Schedule A and Schedule B attached hereto are
           hereby incorporated into, and form part of, this Agreement.

     8.    This Agreement, including the schedules attached hereto and made a
           part hereof, may only be amended by written agreement signed by the
           parties and approved by the Department.

     9.    Unless otherwise specified herein, all notices, instructions, advices
           or other matters covered or contemplated by this Agreement, shall be
           deemed duly given when received in writing (including by fax or other
           similar form of transmission) by you or us, as applicable, at the
           address or fax number first above written or such other address or
           fax number as shall be specified in a notice similarly given:

       If to us:
        Chief Financial Officer
        Crum & Forster Indemnity Company
        305 Madison Avenue
        Morristown, New Jersey 07960
        Telecopy Number 973/490-6612

                   If to you:

       FAIRFAX FINANCIAL HOLDINGS LIMITED
        95 Wellington Street West
        Suite 800
        Toronto, Ontario
        M5J 2N7
        Fax No.: (416) 367-2201

        Any such notice or communication shall be deemed to have been received
        by any such party if delivered, on the date of delivery, or if sent by
        prepaid registered mail on the fourth business day following mailing
        thereof to the party to whom addressed. For such purpose, no day during
        which there shall be a strike or other occurrence interfering with
        normal mail service shall be considered a business day.

     10.   This Agreement shall be governed and construed in accordance with the
           laws of the State of New York, our state of domicile. Each of the
           parties hereto submits to the jurisdiction of the state and federal
           courts of the State of New York, in any action or proceeding arising
           out of or relating to this Agreement and all claims in respect of any
           such action or proceeding may be heard or determined in any such
           court; and service of process, notices and demands of such courts may
           be made upon you by personal service to LeBoeuf, Lamb, Greene &
           MacRae, L.L.P., 125 West 55th Street, New York, New York 10019 or by
           mailing copies of such process, notices and demands by certified or
           registered mail to such address (such address being automatically
           changed to the principal office from time to time of LeBoeuf, Lamb
           Greene & MacRae, L.L.P. in New York, New York).

     11.   You and we and the duly authorized representatives of each of us
           shall, at all reasonable times, each be permitted access to all
           relevant books and records of the other pertaining to this Agreement.
           You and your duly authorized representatives shall provide to the
           Department, within fifteen (15) days of any request from the
           Department therefor, copies of all your books and records as they
           pertain to us (or any portion thereof as may be specifically
           requested).
<PAGE>

     IN WITNESS WHEREOF, this Agreement is hereby executed by duly authorized
officers of the parties hereto as of the date first written above.

                                          CRUM & FORSTER INDEMNITY COMPANY

                                          By:  /s/ RICHARD LUTENSKI
                                            ------------------------------------
                                            Authorized Signature

                                            Richard Lutenski
                                            ------------------------------------
                                            Name of Authorized Signatory

                                          By:  /s/ VALERIE J. GASPARIK
                                            ------------------------------------
                                            Authorized Signature

                                            Valerie J. Gasparik
                                            ------------------------------------
                                            Name of Authorized Signatory

                                          FAIRFAX FINANCIAL HOLDINGS LIMITED

                                          By:  /s/ BRADLEY P. MARTIN
                                            ------------------------------------
                                            Authorized Signature

                                            Bradley P. Martin
                                            ------------------------------------
                                            Name of Authorized Signatory
<PAGE>

                                   SCHEDULE A

                                    SERVICES

     Tasks underlying the fees to be performed by Fairfax Financial Holdings
Limited are:

MONTHLY

--  computation of all regulatory figures

--  analysis and reconciliation of portfolios

--  yield review

--  computation of market decline tests

--  computation of liquidity analysis

--  analysis of bookvalues, e.g. bond amortizations and investment provisions

--  analysis of gross gain and loss positions

--  cash flow obligations

--  investment review meeting

PERIODIC

--  review and analysis of foreign exchange position

--  placement of foreign exchange contracts, where appropriate

--  discussions with regulators regarding portfolio (positions)

--  reporting to the investment committee

--  reporting to the audit committee

--  general assistance with accounting issues

--  maintaining contact with external auditors

--  such other administrative services as the parties shall mutually agree from
    time to time
<PAGE>

                                   SCHEDULE B

                                  FEE SCHEDULE

     Fees will be calculated at the end of each calendar quarter based upon the
average of the market value of the funds held in the investment account (the
"Account") governed by the terms of the Investment Management Agreement between
Crum & Forster Indemnity Company and Hamblin Wasta Investment Counsel, Ltd.,
dated as of August 13, 1998 at the close of business for the three (3) preceding
months. Charges are stated on a calendar year basis.

<Table>
<Caption>
MARKET VALUE                                                   CHARGE
------------                                                   ------
<S>                                                            <C>
On Total Market Value.......................................    .10%
</Table>

     In the event that the day upon which this Agreement is terminated is a day
other than the first day of a calendar quarter, the fees payable for such
quarter shall be pro-rated and shall be determined having regard to the market
value of the Account based upon the most recent financial report which has been
delivered to Crum & Forster Indemnity Company by the Custodian for the Account.

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