Usually, it's not a good idea to take profits, since you accelerate your tax bills that way.
You can buy a contract with only 10% or 15% down, but it's not a good idea.
"It's not a good idea, " says Dr Daniel Frattarelli, chair of the American Academy of Pediatrics committee on drugs.
"It's not a good idea to be this size, " says Mr. Lee, who is also in charge of building other large factories for Hon Hai.
"Simple doesn't necessarily mean it's not a good idea, " he said.
It's also not a good idea for investors to have all of their assets tied up in one fund or with one investment adviser.
That's not to say there's anything wrong with a specialised course, it's that specialising at such an early stage might not be a good idea.
It is perhaps not every reporter's idea of a good time, but I can honestly say that covering the Stafford Hospital public inquiry was one of the most fascinating and memorable years of my life.
Chiseling away at the deficit is a good idea, but it's a tactic, not a strategy.
The commission set up to investigate Wednesday's failure believes already it has a good idea of what went wrong, and so it may not be too long before normal service is resumed.
And if people can show me here's a good idea and here's how we can get it done and it's not something I've thought of, I'm happy to steal people's ideas.
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