Human welfare in Islamic worldview encompasses economic welfare, but comprises much more than that. The achievement of human welfare is sought in both aspects of human life, i.e. worldly life and eternal life hereafter.
Welfare Function in Islam
Ethics and Economics
As much as people can be selfish, they can be altruist as well. They have free will and they can be as much responsible as they can be reckless. What we need is a conditioning mechanism that nurtures positive tendencies.
Islamic Economics Project 