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Thanks luutzu, great post and insight into your investment process.
When you work out forecast earnings for the next 12 months, to what extent do you generally find your figure differs from 1 year consensus forecast normalised earnings/EPS figures quoted on online broker websites?
Just in case you're using the IV = Earnings/r, where r = risk free rate, or interest rate. Not recommended to use r as that.
The r is your required rate of return, so if it's the risk free rate like bonds or term deposit, you might as well put your money there and take on no risk. Investing in businesses have risks. So if r is 4%, that's a P/E ratio of 25... roughly mean you'll get your money back in 25 years - see Switesh post on bird in the hand.
With my estimates... I don't do forecasts. I simply use the what-ifs analysis and after I get to understand the business well enough, see that it is of high quality, financially sound, does not show the need to raise new capital or take on debt to survive... Once I'm happy with it I just do a simply straight line scenario of sales remaining as is, goes down by x%... what price I'm happy with under such circumstances and see what's the offer is.
Though there are companies, as Phillip Fisher discussed in his very good book... that some companies are so exceptional, so able and well managed that they continue to grow year after year... that kind of company would deserves a premium on its "reasonable" price.
How much does the market tend to pay for that premium I don't know, but you can see what you're comfortable with knowing the business as you have come to know, knowing the market level. Though above 25 times earnings is really really pushing the bound of reasonable, high expectation.
Anyway, I'm just starting to sort out a standard approach I could use, never work in the finance industry so take what i learn for what it's worth.
But one thing to take away is Buffett's and Graham's advice to treat stock as a business, not as a financial instrument. As Buffett said, once you think like that, everything else will follow.
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With consensus and expert forecasts, with rating agencies... It's safer to ignore them completely. The expert forecast seem to be very good at forecasting next quarter or next year's earnings... but that could just be pure luck or pure manipulation by management - often I looks like simply straight line projection. No one knows until it's too late.
In my opinion, to accurately forecast a company's future earnings; to forecast it to a high degree of certainty - which is what you ought to else it's just guess work and is more harmful than useful... to get a forecast right to a degree acceptable by science, say +95% certainty the data and samples and figures aren't random guesses... that takes a lot of brain and a lot of work... most of which an analyst working for a fund manager who then give it out for free to newswires for free just can't afford to have.
With the few lawsuits against the major rating agencies in the US after the GFC... most say their work are no more than opinions, like newspaper columns, not advise or expert analysis. But yea, somehow their work affect companies and gov'ts ability and costs to raise fund and attract investors.
Let say you want to forecast a company's earning in two years. How to go about it?
Look at the industry, the structure, the players, the suppliers, the customers, the economy, changing consumer demand... Then once you know all these players and their relationship and influence on one another...
You don't need to go further to know how insane it is to think anyone could do it, and if they could, rating agencies could pay for it.