Still, you can expect to make a few hundred dollars to a few thousands dollars per month with one ebook depending on how good it is. The more value that you can add through that ebook, the more likely it’s going to be successful. Focus on value here and not on how to do the least amount of work for the greatest return if you actually want to succeed with this.
In equity valuation, residual income represents an economic earnings stream and valuation method for estimating the intrinsic value of a company's common stock. The residual income valuation model values a company as the sum of book value and the present value of expected future residual income. Residual income attempts to measure economic profit, which is the profit remaining after the deduction of opportunity costs for all sources of capital.