The major milestone came in 19th century when rag pulp was replaced by wood pulp for making paper. While paper was an expensive commodity across the world initially, the use of wood pulp, advent of paper mills, and introduction of different types of paper ensured that its cost came down drastically over the period. As time elapsed, the use of paper went beyond writing and packaging. The introduction of paper money, bags, plates, etc., made it one of the most important commodity of our life, something which we can't do without.