What are the institutions that make public policy decisions for a society collectively known as?

The answer to the given description above is government for they are a force that drives people to follow rules and laws reinstated and made by the government.  They are the institution in which has made policy decisions to be made public for the sake of the society.

the aksumite empire was an ancient kingdom located in what is now northern ethiopia from the period of 100 ad to 940 ad. its capital was the city of aksum. the kingdom established itself as one of the 4 great powers at its time, along with persia, rome, and china.

the kingdom was rich in goods like gold, iron, and salt. it established strong commercial ties with the regions governed by rome, egypt, and persia (arabia). aksum was a key location in this commercial network. trade was also facilitated with the introduction of the aksumite currency.