<p>Companies around the world spend more than half-a-<em>trillion</em> dollars each year on ads. The ad industry swears by its efficacy — but a massive new study tells a different story.</p>


<description>&lt;p&gt;Companies around the world spend more than half-a-&lt;em&gt;trillion&lt;/em&gt; dollars each year on ads. The ad industry swears by its efficacy — but a massive new study tells a different story.&lt;/p&gt;
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Companies around the world spend more than half-a-trillion dollars each year on ads. The ad industry swears by its efficacy — but a massive new study tells a different story.

Freakonomics Radio

440. Does Advertising Actually Work? (Part 1: TV)

440. Does Advertising Actually Work? (Part 1: TV)

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