What barriers to entry exist in other industries that allow certain firms to operate as a monopoly? are these barriers contestable?

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Avillage levied property taxes of $910,000 for calendar year 2019 on january 1, 2019 and immediately set up an allowance of $10,000 for uncollectible taxes. the village collected $870,000 in cash during 2019. it expected to collect $22,000 of the unpaid taxes during the first 60 days of 2020 and an additional $8,000 during the rest of 2020. how much should the village recognize as property tax revenues in its 2019 general fund financial statements? a) $870,000 b) $892,000 c) $900,000 d) $910,000

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