If research finds that those who drive taxicabs have enlarged areas of their hippocampi, one may be tempted to infer that driving a cab and engaging in such visuospatial activities each day causes the hippocampus areas to grow. this may or may not be the case, and this riddle demonstrates the principle of

This may or may not be the case, and this riddle demonstrates the principle of correlation vs causation.

Explanation:

The term correlation refers to a statistical and numerical measure that indicates the dimension and direction of a relationship between two or more variables. But this does not mean that the alterations of one variable results from the alterations of another variable. On the other hand, causation consists of an event that is the consequence of another event (causal relationship). In other words, it is the principle of cause and effect.

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.