How can Barriers to Entry be made Higher?

-Patents on Key Products or Production Methods. Essentially it Legally Protects the Firm against Rivals from Copying its Homework -Advertising by Incumbent Firms to create Brand Loyalty -Threat of Predatory Pricing by Incumbent Firms. If New Competitors see a 'Price War' then they may not Enter the Market. The lower Prices affects the New Competitors more -Trade Restrictions (Tariffs or Quotas) restricting Foreign Competition in Domestic Markets -Incumbent Firms Vertically Integrate - Access to Suppliers making it Hard for New Competitors -Sunk Costs (Barrier to Exit) high. Sunk Costs relates to Costs not able to be Recovered when the Firm exits the Industry ie Specialised Equipment or Advertising. If Sunk Costs are high, it again Disways Competition