It is a pro advertizing a brand of skateboards for example rob
dyrdek is sponsored by alien workshop since he rides a alien
workshop deck he is advertizing it same thing with dc since he
wears it the company pays him.
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That's easy--word of mouth from satisfied customers. Ask for referrals.
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In the terms of accounting - advertising would be a debit -
since you would be paying someone to advertise your business.