Exhibit 99.(16)

POWER OF ATTORNEY

I, Richard Q. Armstrong, as Trustee of UBS Investment Trust, UBS Money Series, PACE Select Advisors Trust, UBS Managed Municipal Trust, Master Trust and UBS Municipal Money Market Series (each a “Trust”), hereby constitute and appoint Joseph Allessie, Mark F. Kemper, Eric Sanders, Keith A. Weller, Jack W. Murphy, Stephen H. Bier, Julien Bourgeois, Lisa R. Price and Stephen T. Cohen, and each of them singly, my true and lawful attorneys, with full power to sign for me, in my name and in my capacity as Trustee of each Trust, any amendments to the current registration statement of the Trust on Form N-1A (as filed with the Securities and Exchange Commission) and all instruments necessary or desirable in connection therewith, and hereby ratify and confirm my signature as it may be signed by said attorneys to these amendments and other instruments.

/s/ Richard Q. Armstrong

Richard Q. Armstrong

Trustee

November 22, 2010

POWER OF ATTORNEY

I, Alan S. Bernikow, as Trustee of UBS Investment Trust, UBS Money Series, PACE Select Advisors Trust, UBS Managed Municipal Trust, Master Trust and UBS Municipal Money Market Series (each a “Trust”), hereby constitute and appoint Joseph Allessie, Mark F. Kemper, Eric Sanders, Keith A. Weller, Jack W. Murphy, Stephen H. Bier, Julien Bourgeois, Lisa R. Price and Stephen T. Cohen, and each of them singly, my true and lawful attorneys, with full power to sign for me, in my name and in my capacity as Trustee of each Trust, any amendments to the current registration statement of the Trust on Form N-1A (as filed with the Securities and Exchange Commission) and all instruments necessary or desirable in connection therewith, and hereby ratify and confirm my signature as it may be signed by said attorneys to these amendments and other instruments.

/s/ Alan S. Bernikow

Alan S. Bernikow

Trustee

November 22, 2010

POWER OF ATTORNEY

I, Richard R. Burt, as Trustee of UBS Investment Trust, UBS Money Series, PACE Select Advisors Trust, UBS Managed Municipal Trust, Master Trust and UBS Municipal Money Market Series (each a “Trust”), hereby constitute and appoint Joseph Allessie, Mark F. Kemper, Eric Sanders, Keith A. Weller, Jack W. Murphy, Stephen H. Bier, Julien Bourgeois, Lisa R. Price and Stephen T. Cohen, and each of them singly, my true and lawful attorneys, with full power to sign for me, in my name and in my capacity as Trustee of each Trust, any amendments to the current registration statement of the Trust on Form N-1A (as filed with the Securities and Exchange Commission) and all instruments necessary or desirable in connection therewith, and hereby ratify and confirm my signature as it may be signed by said attorneys to these amendments and other instruments.

/s/ Richard R. Burt

Richard R. Burt

Trustee

November 22, 2010

POWER OF ATTORNEY

I, Meyer Feldberg, as Trustee of UBS Investment Trust, UBS Money Series, PACE Select Advisors Trust, UBS Managed Municipal Trust, Master Trust and UBS Municipal Money Market Series (each a “Trust”), hereby constitute and appoint Joseph Allessie, Mark F. Kemper, Eric Sanders, Keith A. Weller, Jack W. Murphy, Stephen H. Bier, Julien Bourgeois, Lisa R. Price and Stephen T. Cohen, and each of them singly, my true and lawful attorneys, with full power to sign for me, in my name and in my capacity as Trustee of each Trust, any amendments to the current registration statement of the Trust on Form N-1A (as filed with the Securities and Exchange Commission) and all instruments necessary or desirable in connection therewith, and hereby ratify and confirm my signature as it may be signed by said attorneys to these amendments and other instruments.

/s/ Meyer Feldberg

Meyer Feldberg

Trustee

November 22, 2010

POWER OF ATTORNEY

I, Bernard H. Garil, as Trustee of UBS Investment Trust, UBS Money Series, PACE Select Advisors Trust, UBS Managed Municipal Trust, Master Trust and UBS Municipal Money Market Series (each a “Trust”), hereby constitute and appoint Joseph Allessie, Mark F. Kemper, Eric Sanders, Keith A. Weller, Jack W. Murphy, Stephen H. Bier, Julien Bourgeois, Lisa R. Price and Stephen T. Cohen, and each of them singly, my true and lawful attorneys, with full power to sign for me, in my name and in my capacity as Trustee of each Trust, any amendments to the current registration statement of the Trust on Form N-1A (as filed with the Securities and Exchange Commission) and all instruments necessary or desirable in connection therewith, and hereby ratify and confirm my signature as it may be signed by said attorneys to these amendments and other instruments.

/s/ Bernard H. Garil

Bernard H. Garil

Trustee

November 22, 2010

POWER OF ATTORNEY

I, Heather R. Higgins, as Trustee of UBS Investment Trust, UBS Money Series, PACE Select Advisors Trust, UBS Managed Municipal Trust, Master Trust and UBS Municipal Money Market Series (each a “Trust”), hereby constitute and appoint Joseph Allessie, Mark F. Kemper, Eric Sanders, Keith A. Weller, Jack W. Murphy, Stephen H. Bier, Julien Bourgeois, Lisa R. Price and Stephen T. Cohen, and each of them singly, my true and lawful attorneys, with full power to sign for me, in my name and in my capacity as Trustee of each Trust, any amendments to the current registration statement of the Trust on Form N-1A (as filed with the Securities and Exchange Commission) and all instruments necessary or desirable in connection therewith, and hereby ratify and confirm my signature as it may be signed by said attorneys to these amendments and other instruments.

/s/ Heather R. Higgins

Heather R. Higgins

Trustee

November 22, 2010

POWER OF ATTORNEY

I, Barry M. Mandinach, as Trustee of UBS Investment Trust, UBS Money Series, PACE Select Advisors Trust, UBS Managed Municipal Trust, Master Trust and UBS Municipal Money Market Series (each a “Trust”), hereby constitute and appoint Joseph Allessie, Mark F. Kemper, Eric Sanders, Keith A. Weller, Jack W. Murphy, Stephen H. Bier, Julien Bourgeois, Lisa R. Price and Stephen T. Cohen, and each of them singly, my true and lawful attorneys, with full power to sign for me, in my name and in my capacity as Trustee of each Trust, any amendments to the current registration statement of the Trust on Form N-1A (as filed with the Securities and Exchange Commission) and all instruments necessary or desirable in connection therewith, and hereby ratify and confirm my signature as it may be signed by said attorneys to these amendments and other instruments.

/s/ Barry M. Mandinach

Barry M. Mandinach

Trustee

November 22, 2010

POWER OF ATTORNEY

I, Mark E. Carver, as President of UBS Investment Trust, UBS Money Series, PACE Select Advisors Trust, UBS Managed Municipal Trust, Master Trust and UBS Municipal Money Market Series (each a “Trust”), hereby constitute and appoint Joseph Allessie, Mark F. Kemper, Eric Sanders, Keith A. Weller, Jack W. Murphy, Stephen H. Bier, Julien Bourgeois, Lisa R. Price and Stephen T. Cohen, and each of them singly, my true and lawful attorneys, with full power to sign for me, in my name and in my capacity as President of each Trust, any amendments to the current registration statement of the Trust on Form N-1A (as filed with the Securities and Exchange Commission) and all instruments necessary or desirable in connection therewith, and hereby ratify and confirm my signature as it may be signed by said attorneys to these amendments and other instruments.

/s/ Mark E. Carver

Mark E. Carver

President

November 22, 2010

POWER OF ATTORNEY

I, Thomas Disbrow, as Vice President and Treasurer of UBS Investment Trust, UBS Money Series, PACE Select Advisors Trust, UBS Managed Municipal Trust, Master Trust and UBS Municipal Money Market Series (each a “Trust”), hereby constitute and appoint Joseph Allessie, Mark F. Kemper, Eric Sanders, Keith A. Weller, Jack W. Murphy, Stephen H. Bier, Julien Bourgeois, Lisa R. Price and Stephen T. Cohen, and each of them singly, my true and lawful attorneys, with full power to sign for me, in my name and in my capacity as Vice President and Treasurer of each Trust, any amendments to the current registration statement of the Trust on Form N-1A (as filed with the Securities and Exchange Commission) and all instruments necessary or desirable in connection therewith, and hereby ratify and confirm my signature as it may be signed by said attorneys to these amendments and other instruments.

/s/ Thomas Disbrow

Thomas Disbrow

Vice President and Treasurer

November 22, 2010