Your niece loves to play peek-a-boo. the way that you like to play is to put your blanket over your face and after a few seconds abruptly remove the blanket. each time that you remove the blanket, your niece acts like she is very surprised to see you. according to piaget, what concept does your niece lack?

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.

answer; regard the action of other people negatively;