3 ms·
ad spend (as percentage of gdp) has remained constant for more than 100 years https://1.bp.blogspot.com/-BVIsd8mMLFM/Wk7XXTQvWEI/AAAAAAAAIp0/vrOlEfMwqxAqfkqkQ6
by return1 7y ago
ad spend (as percentage of gdp) has remained constant for more than 100 years
https://1.bp.blogspot.com/-BVIsd8mMLFM/Wk7XXTQvWEI/AAAAAAAAIp0/vrOlEfMwqxAqfkqkQ6MdZ_Blu8kgv6vGwCLcBGAs/s1600/nakamura%2B1.jpg https://1.bp.blogspot.com/-BVIsd8mMLFM/Wk7XXTQvWEI/AAAAAAAAI...