How ad spending in the US compares to the rest of the world

While it may not immediately occur to most people, the advertising industry is one of the largest and most pervasive industries in the world and also one of the most multifarious. When you think of advertising, some common modes include television ads, internet ads, radio commercials, physical advertisements such as billboards and signage, and social media campaigns. But within each of these categories are even further sub-categories, and how each is employed and consumed differs from country to country, which is also to say they differ by society.

Do you know that you have ad campaigns that are working, but don't know why?