Another term for air movement caused by differences in air pressure is:
WIND
The pronoun in that sentence is "their."
Answer:
Be installed / the free-rider problem.
Explanation:
The free-rider problem is the definition to a market failure in which those who benefit from a certain resource (in this case the security system) does not pay for said resource. In this case, given that the security system will cover the whole building, those (like Tom) that do not pay will continue to benefit from it regardless.
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