Thinking on a larger scale, reprography is essential to the functioning of society as we know it. This can be most clearly seen any time someone needs to make a copy of a document or form. Examples of such occasions include filling out receipts, writing out checks, or signing legal papers. All of these documents require multiple copies for the main recipient, the signee, and any other parties that need access to the documents.
The most convenient way to create these copies is with an invention that powers much of society without most people ever giving it a thought. Here is some information on carbonless copy paper.