In a science fiction story about hostile aliens invading Earth, the major conflicting political powers join together to combat the extraterrestrial threat. Generalizing from Muzafer Sherif's research, it is safe to conclude that this act of cooperative behavior would lead to:

it should be d or b but i'm sure it's d

i believe the answer is: returns on investments, no wages

people who belong in upper class society would most likely get there by obtaining multiple source of income, which a certain percentage of ownership for businesses. since most of them are job creator, they would most likely get their money from profit, not wages.

answer; early greeks were econimically stagnant and cut off from other near eastern civilizations;