Oil is often called black gold. It's all about the value of the mineral, and the countries in the bowels of which there is oil, have always been considered one of the richest and most prosperous. True, the economies of almost all of them, with the possible exception of Norway, are tied to oil, and the growth and fall in prices for black gold can be a decisive factor.The world experienced the last sharp drop in oil prices in 2015, when the barrel...

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