Advertisement are the medium of creating brand awareness, and when we aren't able to convert those prospective customers then only we realise that money is wasted.
Advertisement is an important tool in marketing to spread wide awareness and to reach the targeted market segment and the territory. It helps to reach the potential business partners and potential customers.
A lot of in house research analysis and ROI has to be done before going for it. Comparative result analysis helps in understanding the impact and returns of the advertisement before going in for full campaign.
Before hand it is important to know the market potential, segment targeted and frequency of the campaign.