That is right. The size of the business determines a lot on how much it will spend on advertisement. Big businesses require more money than small businesses. Also, it depends on how popular your business is. Most unknown businesses will have to spend more to create awareness.The size of the business and what they hope to achieve in a given period of time should determine what is set aside for the advertisement budget.
Naturally a big company like sony, LG electronics and the likes would be able to spend more on advertisement than a small businesses and Enterprises.