Many good investors mention that one should also look at the size of the opportunity (how big the market is for the products of the company). What are some good ways to gauge that? Making general assumptions like India has shortage of power, so there is a huge opportunity. But thinking on these lines may not be a good way to gauge the size of the opportunity as its not a very objective analysis and on similar lines we can find shortage of almost anything like affordable homes, infrastructure etc. Recently one investor made a pertinent remark in favor of United Spirits that India is a young country and alcohol is one thing which can’t be digitized and is immune from Chinese imports. So its a huge market for USL. But these are very subjective ways to understanding the market size.
In my opinion some of the methods to fine tune or to bring more objectivity to measure the market size are-
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One way is to get this information from the Annual Reports. Usually the good ARs contain the market size of the product in which they are competing and their position.
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Reading reports from some good consulting firms like the below link focuses on consumer spending in India
https://www.bcgperspectives.com/content/articles/consumer_products_retail_the_tiger_roars/
What are the other ways to gauge the opportunity size? Also how important is to focus on opportunity size?