I've been playing around with a few options in the last few months.VES, when you talk about no growth and then talk about maintaining earnings power..I presume that you are referring to a business being able to maintain margins and increase revenue in-line with, but not above, inflation?
That is what I do in the large majority of the valuations I do..
Basically I take the FCFF (or whichever you use) from the last period of your cash flow analysis and divide it by some sort of risk-adjusted cost of capital for the firm (usually between 11% and 15%).
So say at year 10 you had cash flow of $1 a share and I thought the cost of capital should be 12% for UGL. TV at year 10 would be $8.33. Discounted back to year 0 at 15% (my required rate of return before tax) this'd be $2.06. as I said I would personally adjust this based on my confidence in the enduring competitive advantage of the business. So for instance.... $2.06 x 50% = $1.03. It's pretty arbitrary as all valuation is, but it makes you think about the competitive advantage and how far above the replacement cost of assets you are willing to pay for it in today's dollars.
Here's a comparison of the same for 5 different scenarios using $1 as the base earnings at year 10. Discount rate from year 10 to year 0 is always 15% in all scenarios.
Scenario A B C D E
TV Disc 11% 12% 13% 14% 15%
TV $9.09 $8.33 $7.69 $7.14 $6.67
Year 0 $2.25 $2.06 $1.90 $1.77 $1.65
Scenario A is 36% higher than scenario E. B is 25%, C 15% and D 7%.... which demonstrates that discount rates impact the result pretty quickly.