Economic Theories for the creation of a new or separate Industry?
Have a look at monopolistic competition. It basically details how many industries can find their own niche in a differentiated product market. Some prominent papers in the subject:


Dixit and Stigliz: Monopolistic Competition and Optimum Product Diversity
Krugman: Increasing returns, monopolistic competition, and international trade
Salop: Monopolistic Competition with Outside Goods