There are a number of excellent downloadable resources that provide in depth information on Supply Management:
The Need for Supply Management: an Economic Rationale, Dr. Maurice Doyon for Dairy Farmers of Canada
Trade Truths, Peter Gould, General, Manager, Dairy Farmers of Ontario
Regulated Markets Work, Dairy Farmers of Canada
Alberta Supply Management Bookmark on Supply Management
Myths about supply management, Dairy Farmers of Canada
Alberta Supply Management: Local Farmers Producing Quality Products Infographic