For my personal retirement portfolio, I only hold 7 Canadian dividend payers that appear to have a simple wide moat. Canada is unique in that certain companies in certain sectors have worked their way to an oligopoly situation - protected from competition. They are protected by regulations, the Canadian preference and incredible barriers to entry. While this still does not guarantee business success, I feel and hope that it will allow for continued business health, making for continued generous and growing dividends.
Here's the intro to The Dividend Growth Wide Moat 7 From Canada.