There are many ways on how to value a company using the different methodology school of thoughts. 

I had previously wrote an article about two of the methodology which you can view over here. One of the valuation methodology, Discounted Cash Flow (DCF) is one of the most commonly used across investors for many reasons.

The recent monetary policy of heavy quantitative easing done across the globe seems to suggest that we are on a decade long of low interest rate where it allows stimulation of funds chasing around after riskier assets, such as equity and housing. 

In general, the objective of the easing of monetary policy and reduction of the banks' reserved rate is to allow banks to lend more money to companies so they are able to fund the loan at cheaper rate and expand to grow at a faster rate than if there were no easing on the policy.

These popular monetary easing policy has resulted in a euphoria spike in interests for both the investors and media pundit and it has helped to push the share price of many stock markets to its high despite the problems ahead. Just take a look at where the US market is heading today and you will understand my point.

As a result of such phenomenon, this usually poses a problem to investors when they are trying to simulate DCF and project earnings or cash flow across the next 5 years or more. 

One. The discount factor would be affected because as interest rate gradually rises, the proportion that is financed by debt would increase as the cost of debt becomes more expensive. This means that the discount rate would have to increase over time and using a standard discount rate across can be deceptive to an investor at best, especially if this is extrapolated over longer number of years.

Second. The growth (g) factor would also need to be adjusted conservatively downwards with everything else equal once the policy is back to normal. What this means is if you are expecting to project a company to grow at 10% during periods of easy monetary policy, then you should expect earnings growth to be lower once things are back to the normal. By standardizing the growth over the next 10 years and extrapolating them over time, it will create a false sense of guide and misguide the fair value perception for the investor. 

The quantitative easing will come to an end sooner or later. The US is already showing signs that the Fed will be raising interest rate hike by a couple of percentage point this year. When they do, investors will need to be mentally prepared because this will have an impact on the valuation of the company, especially if you aggressively value your company at the beginning.