I have a strong background in physics. I am wondering if I can build a list in physics to whom multiple products can be offered.
How do I find products in this niche which are profitable enough to market? I googled up and found mostly books and courses aimed at students. I am assuming it is not possible to sell additional products to an audience like students. In other words, the niche lacks continuity. I get the feeling that I am looking at the wrong places.
Is physics not profitable or am I doing something wrong?