As you want the list of Best Undergraduate Economics Schools In The World here I am giving the same may this helps you.

List of Best Undergraduate Economics Schools in The World:
School Name Country

London School of Economics and Political Science (LSE) United Kingdom
University of Chicago United States
University of California, Berkeley (UCB) United States
Stanford University United States
University of California, Los Angeles (UCLA) United States
UCL (University College London) United Kingdom
Harvard University United States
Massachusetts Institute of Technology (MIT) United States
Università Bocconi Italy
Australian National University Australia
University of Michigan United States
Princeton University United States
Yale University United States
University of Cambridge United Kingdom
Columbia University United States
University of Oxford United Kingdom
University of Pennsylvania United States
New York University (NYU) United States
National University of Singapore (NUS) Singapore
Northwestern University United States
The University of Warwick United Kingdom
The University of Melbourne
The University of Tokyo Japan
Cornell University United States
University of Toronto Canada