The core of a business model can be confirmed properly by investigating the field practically. So, when the primary business model is confirmed then this wheel (start-up) can be assigned to implement the theory into practical environment. By the result it would be much easier to determine the exact radius of the core.
Continuous cash flow is truly the life blood of a business. When a particular business has more outgoing than incoming money, it is called negative cash flow. ”A check/paper in hand means nothing,you need cash.” it is impossible to sustain a business with long term negative cash flow.