I hear this question all the time. Is it 10%, 20%, 5% or is there a sophisticated formula to figure it out? The answer is that the only sane marketing budget is a blank check. Seriously, if I am selling $20 bills for $10, how many would you buy - As Many As You Could, right? Your goal is to find something that works and then repeat that activity over and over until you find something that works better. Theres is a lot more to it but but it is very simple once you get your head around it and it will change you business, and marketing, forever.