What percentage of revenue should marketing take up?

When budgeting for your organisation, how do you allocate funds for marketing efforts?

Do you allocate a percentage of revenue to marketing? If so, what percentage? 2%? 5%? I have done some research, and see that a number of US companies budget anything up to 25%!!!

Or do you budget by quarter? By project? By campaign?

All comments appreciated!


 
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