When Barack Obama’s approval ratings were high, polls found that a larger number of people claimed to have voted for him than actually did vote for him. Historians report that the percentage of people who remember voting for any president rises and falls with the president’s approval ratings, perhaps because more people believe that they should have voted differently. This belief is an example of

answer; ///(positive correlation);

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for many centuries there were important factors which the economies of the muslim empires developed increasingly. they applied economic procedures in production, investment, finance, taxation and property. they used to tax certain goods (for example: harvest), they charged interest on money lent, they signed contracts with merchants; they relied on a common currency, and they used checks as well as promissory notes. with the money collected by means of taxation, the government provided the needy with an income. in addition, trading networks covered huge distances, so far regions started to have contact and exchange goods. this trade network covered areas of asia, africa and europe.