What is the difference between a hierarchical and flat organizational structure

What is the difference between a hierarchical and flat organizational structure and in your reasoned opinion which is the best structure for public administrators to be most effective and efficient in delivering government services to taxpayers and residents?Make sure to include your name on this assignment.This assignment is a Research Assignment. You must research academic journals, think tank publications,findlaw.com, articles from major newspapers and other reputable sources.
The paper must include
Cover Page
Abstract• Table of Contents• Substantive history, current facts, analysis• Bibliography (identify ALL sources