1. Starting a zoo has a high entry cost.
2. Value chain.
3. Other firm can neutralize the advantage by cutting prices to the same level.
4. Using only trees and grasses that are naturally pest resistant.
5. Calculate inputs and outputs.
6. Competitive strategy.
7. Rivalry.
8. Porter's five forces model.
9. Strawberry growers following an unexpected frost.
10. Purchasing books from a publishing house.
