Running a product company is like trying to solve an algebraic equation that has no answer. By definition, you never have the money you need to get bigger, because the inventory you need to buy now won’t sell until much late and the faster you grow, the more you have to buy now for later.
The biggest expense that any business has is the cost of people to help you grow. In some financial industries that don’t sell any tangible products that cost alone can be 80% of the money they generate. This is another cost of growth that defies equations, you often need better people than you can actually afford before you can afford them.