The best and most correct answer among the choices provided by the question is the third choice "natural monopolies"
Natural monopolies<span> arise where the largest supplier in an industry, often the first supplier in a market, has an overwhelming cost advantage over other actual or potential competitors; this tends to be the case in industries where fixed costs predominate.</span>
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<h2>Answer: </h2>
The Abbasid regime made changes int he former era in order to build a nation based on the equity of all Muslims. The new leaders opposed the extensive military victories in stopping the dominance of the Arab military class. They ended hatred against non - Muslims and made Islam a stronger diverse religion. The Abbasid also shifted the center from Damascus to Baghdad, a tiny market city on the shores of the Tigris river.
<span>The United States have had a trade deficit over the past two decades because the nation had a persistent trade deficit. Since the 1970s, The United States had entered into a trade deficit, from trade surplus. This started because Japan and Europe started trading and competing with US, in a range of industries.</span>
Answer: I don't know what your talking about
Explanation: but I am happy to help
