Look at performance of the assets

"I bought a piece of real estate in New York in 1992, I have not had a quote on it since. I look to the performance of the assets. Maybe...my piece of real estate have had pull backs, but I don't even know about 'em. People pay way too— way too much attention to the short term. If you're getting your money's worth in a stock, buy it and forget it."- Wareen Buffett

Interest Rate

"...interest rates act like gravity to other asset prices. Everything is based off them." - Warren Buffett

Stay within Circle of competence to avoid big mistakes

"Warren and I have skills that could easily be taught to other people. One skill is knowing the edge of your own competency. It's not a competency if you don't know the edge of it. And Warren and I are better at tuning out the standard stupidities. We've left a lot of more talented and diligent people in the dust, just by working hard at eliminating standard error." - Charlie Munger in the Stanford Lawyer (Page 19)

Overconfidence

"Smart people aren't exempt from professional disasters from overconfidence. Often, they just run aground in the more difficult voyages they choose, relying on their self-appraisals that they have superior talents and methods." - Charlie Munger in a Speech to Foundation Financial Officers

durability of investment ideas

Some think if an investment idea is well-known and seems obvious it can't be really good. In 1938, Fortune Magazine concluded "Several times every year, a weighty and serious investor looks long and with profound respect at Coca-Cola's record, but comes regretfully to the conclusion that he is looking too late." Since that time, Coca-Cola has grown significantly both domestically and around the world. It was not too late in 1938, and we believe it is far from that today. - From the 1Q 2010 Yacktman Quarterly Letter

focus investing

Charlie Munger in one of Wesco meeting:
It's a good question. Our approach has worked for us. Look at the fun we, our managers, and our shareholders are having. More people should copy us. It's not difficult, but it looks difficult because it's unconventional -- it isn't the way things are normally done. We have low overhead, don't have quarterly goals and budgets or a standard personnel system, and our investing is much more concentrated than average. It's simple and common sense.

Our investment style has been given a name -- focus investing -- which implies 10 holdings, not 100 or 400. Focus investing is growing somewhat, but what's really growing is the unlimited use of consultants to advise on asset allocation, to analyze other consultants, etc.

I was recently speaking with Jack McDonald, who teaches a course on investing rooted in our principles at Stanford Business School. He said it's lonely -- like he's the Maytag repairman.

Great Businesses

It's obvious that if a company generates high returns on capital and reinvests at high returns, it will do well. But this wouldn't sell books, so there's a lot of twaddle and fuzzy concepts that have been introduced that don't add much -- like cost of capital. It's accepted because some of it is right, but like psychoanalysis, I don't think it's an admirable system in its totality. - Charlie Munger