For the Past Three Years, You Have Earned Economic Profits

Short Answer

For the past three years, you have earned economic profits of $5,000 per year by being the only vendor selling bottled tap water at your town's Fourth of July celebration. When you go to city hall to apply for a vending permit for this year's celebration, the city clerk mentions that fifty new firms have received permits to sell tap water this year.
-What can you do to protect your economic profit in the long run?