7. For each of the following goods or bads, decide whether they are rival and whether they are excludable, and explain your answer. If you think the answer depends on factors not specified here, explain how.
a. A free public lecture held at a university lecture theatre
b. Noise produced by aircraft around an international airport
c. A public park
d. A forest used by local people to collect firewood
e. Seats in a theatre to watch a musical
f. Bicycles available to the public to hire to travel around a city
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7. For each of the following goods or bads, decide whether they are rival and whether they are excludable, and explain your answer. If you think the answer depends on factors not specified here, explain how.