I believe the answer is: Capitalism
In capitalism, the economy is designed in a way to give as much freedom as it can to the private sectors in term of resource allocation and market competition. In this system, the government's role limited to maintaining regulation that prevent private organizations from cheating off one another.
<span>Sometimes, a user fee is indeed a user fee. But other times it's not that at all; instead, it's a tax hike disguised by a misnomer.</span>
Suppose GetThere Airlines increases their ticket price to $200+10n = 10(20+n)$ dollars. Then the number of tickets they sell is $40,000-1000n = 1000(40-n)$ .<span> Therefore, their total revenue is
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$$10(20+n)\cdot 1000(40-n) = 10000(20+n)(40-n) = 10000(800+20n-n^2).$$
This is maximized when $n=-\left(\frac{20}{2\cdot(-1)}\right)=10$ .<span> Therefore, they should charge </span><span>$200+10\cdot 10 = \boxed{300}$</span><span> dollars per ticket.</span>
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Answer:
Today, the existing communist states in the world are in China, Cuba, Laos and Vietnam. These communist states often do not claim to have achieved socialism or communism in their countries, but to be building and working toward the establishment of socialism in their countries.
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