Oriental Trading, one of the Top $100$ internet retailers, is well known for its inexpensive party supplies, school supplies, and novelty items. Despite its name, the company is headquartered in Omaha, Nebraska. If you look at the Oriental Trading website, you will see that you can get $300$ animalshaped mini$-$erasers for $$6\mathrm{.}99$ and $72$ pencil sharpeners for $$7\mathrm{.}29.$ These low prices are possible because the items are mass$-$produced by the millions. Which aspect of the Industrial Revolution allows for the mass inexpensive production of the items sold by Oriental Trading?