A company must decide how to allocate its advertising budget over space as well as over time.
The company makes “national buys” when it places ads on national TV networks or in nationally
circulated magazines. It makes “spot buys”when it buys TV time in just a few markets or in regional
editions of magazines. These markets are called areas of dominant influence (ADIs) or designated
marketing areas (DMAs). The company makes “local buys” when it advertises in local newspapers,
radio, or outdoor sites