If this comment has already been brought up, I apologize...
Wouldn't it be better to have your price be a certain percentage of your cost?  Then when your costs go up, your prices go up by a certain percentage automatically and you're not having to update twice the number of fields?
:-)

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Reply from Richard Rost:

That's certainly an option for some situations. If you want to set up your database that way, then that's fine. What if you have a particular product that is a good seller and you advertise it for $14.99, then your costs go up a little bit. You don't want to kill your promotion over a few cents. Always making your prices a function of cost can be troublesome.