Final answer:
The term for the payments that Akkadian rulers demanded from conquered peoples to show submission is 'tribute'.
Step-by-step explanation:
The term that refers to the payments Akkadian and later Neo-Assyrian rulers forced upon those they ruled or conquered to show submission is known as tribute. These payments were a form of economic and political control to keep vassal states in line and to avoid military assault.
Tributes could consist of various goods, from agricultural products to luxury items, depending on the resources of the regions under Akkadian dominance.