5. Notebooks and other paper products
This business involves a bit of creativity, but it can definite be one the most profitable manufacturing businesses to start. The more unique your products are, the more customers it will attract. Apart from notebooks, there are plenty of other products made of paper that, with a bit of unique design can make a lot of money. Those are, for example, paper bags, envelopes, greeting cards, or even paper jewelry, why not!
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