A Quranic explanation on the variety of daily bread

Human life is in vital need of daily bread, and, as is said in Quran, God has guaranteed human daily bread. Yet, as is seen, there is not equality in daily bread of people. How can we explain such a disparity with regard to the absolute justice of God? Without a reasonable answer to this question, Divine justice would remain unexplained. Regarding the close relation between daily bread and Divine justice, the paper has presented a reasonable explanation on human daily bread and Divine justice. In this way, the differences in daily bread have been philosophically justified.