Big data holds out big promises for marketing. Notably, it pledges to answer two of the most vexing questions that have stymied marketers since they started selling: 1) who buys what when and at what price? and 2) can we link what consumers hear, read, and view to what they buy and consume?Answering these makes marketing more efficient by improving targeting and by identifying and eliminating the famed half of the marketing budget that is wasted.

Source: Use Big Data to Create Value for Customers, Not Just Target Them

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