'It's a black hole': Marketers are taking more control over their co-op advertising - Digiday

'It's a black hole': Marketers are taking more control over their co-op advertising Digiday For many brands, co-op advertising, also known as wholesale marketing, has long been a black hole, agency and brand executives said. But with department stores' retail sales declining, partly due to the rise of Amazon, marketers are demanding that the ...