Becky and Ishiguro decide to head up to Noosa Beach in the middle of winter and are delighted to find that no one is there. In January, the two recall how much fun they had at the beach in winter and decide to head up to Noosa Beach once more. However, this time they are upset to find the beach is crowded with people. Select the item from the list provided to make the following statements true. - These two situations reveal that rivalry exists across a __________ and is not always fixed. - The marginal cost, for Becky and Ishiguro, of another person using the beach in winter is effectively __________. - In summer when the beach has become crowded, the beach can be considered to have become a _______ good. 1. > 0 2. Common 3. Collective 4. Binary category 5. Tragedy of the Commons 6. Non-rivalrous 7. Excludable 8. Rivalrous 9. Private 10. 0 11. Public 12. Spectrum