please explain correctly.

[1] From year 0 to 1750 the world's population increased from about _ million to _ million. What happened to per capita income over this period? (2 points} [2] What happened to world-wide production from 1960 to 2000? {Give the actual numbers.) What happened to world-wide per capita income over this period? [3] What is meant by the term "dentographic transition?\" [4] How does Gary Becker explain the demographic transition