Discuss the various approaches to revenue and earnings estimation and present your opinions on when to apply each method.

Top-down analysis takes an overall look at the market size or potential of a given industry and uses that information to estimate the company’s future earnings capacity. This method is best used in industries with limited competition where the size of the entire market can be accurately predicted.

Bottom-up analysis begins by analyzing each individual component or business unit within a company to determine their contribution to total revenues and profits. This approach works well for multi-divisional companies but can also be applied when looking at competitors as it allows investors to compare individual performance metrics such as gross margins, sales growth rates, etc.

Comparable companies is a technique in which similar publicly traded firms are compared against one another in order to gauge estimated values for certain metrics such as expected earnings per share or price/earnings ratios. This method works best when there are enough publicly traded peers in the same sector so that meaningful comparisons can be made between them.

In my opinion, I believe each method has its place depending on the context of valuation being performed. The top down approach generally works better for long term projections whereas bottom up is more appropriate for shorter term valuations. Comparable companies provides useful data points for estimating value metrics like P/E ratio but should not be relied upon exclusively without considering other factors such as competitive dynamics or macroeconomic conditions that could affect a particular stock’s performance over time.