All good realtors knows that the three most important points to look for in buying a property is location, location, and location. The basic point is simple; location is the most important criteria in any business or marketing campaign. The reasons for this should be obvious.
First, if no one sees your marketing, no matter how good it is, it is worthless. It would not be too strong to say that it is even a waste of money. For there to be successful marketing, location is key. People or customers must see and be engaged with the marketing. Hence, you must market where people are.
Second, there should be additional thought as to location. You should also think about when you want to engage people with marketing. Do you want to reach them during the morning or evening rush, while they are working out in the gym, or some other time. If you think about this time element, there are more variables in terms of location.
As to your second question, depending on when and where you engage the potential customer, their responses will differ. Some study here will be important, because in marketing what you want is to get your customer to use your produce or service. So, you want to advertise at the most opportune time and place.