So I presented The Personal MBA book to Jose at the Universidad Externado, and he liked it and mentioned this other model: https://en.wikipedia.org/wiki/Business_Model_Canvas
Business Model Canvas is a strategic management and lean startup template for developing new or documenting existing business models. It is a visual chart with elements describing a firm’s or product’s value proposition, infrastructure, customers, and finances. It assists firms in aligning their activities by illustrating potential trade-offs.
He mentioned that it majorly boils down to having an unfair advantage: what makes this business, or this business model, better than the competition? (Because if nothing, it’s not worth pursuing.)