Tier of Traffic: When speaking about tiers in advertisements, commonly this refers to how a given nation is categorised. Tier 1 GEOs can be nations that almost all sellers are looking to target, when possible within the context of a given offer. These countries are generally the wealthiest, where end users have a big amount of disposable income, and there is numerous competition for the traffic accessible from them. Tier 2 is a bit less competitive with the common income per person being lower.
Tier 3 nations are usually developing nations, where the common person has low buying power, but there is also less competition for the site visitors. The most successful media buyers know how to utilize all tiers by taking advantage of the professionals of each tier’s traffic.