According to Jean Mandler, refers to categorizations of objects by infants based on similar features of the objects, such as size, color, and movement, as well as parts of the objects, such as legs for animals.

Perceptual categorization

Explanation: Perceptual categorization can be explained as the ability of an individual to characterize, segment or classify objects based on observable physical attributes. Perceptual categorization is commonly attributed to infants as it is a very fundamental ascent of cognitive development. It involves identifying and examining what an object looks like and distinguishing these objects based on their physical attributes such as size, color, height, movement, shape and so on.

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.