You could take all the gold that's ever been mined, and it would fill a cube 67 feet in each direction. For what that's worth at current gold prices, you could buy all -- not some -- all of the farmland in the United States. Plus, you could buy 10 Exxon Mobils, plus have $1 trillion of walking-around money. Or you could have a big cube of metal. Which would you take? Which is going to produce more value?

Does the business have favourable long term prospects?

I have worked with investors for 60 years and I have yet to see anyone - not even when capital gains rates were 39.9 percent in 1976-77 - shy away from a sensible investment because of the tax rate on the potential gain.

The best business returns are usually achieved by companies that are doing something quite similar today to what they were doing five or ten years ago.

I put heavy weight on certainty. It's not risky to buy securities at a fraction of what they're worth.

If you've got the power to raise prices without losing business to a competitor, you've got a very good business. And if you have to have a prayer session before raising the price by a tenth of a cent, then you've got a terrible business. I've been in both, and I know the difference.

It is impossible to unsign a contract, so do all your thinking before you sign.