This document discusses the paradox of decreased advertising spending resulting from increased advertising performance, known as the "Paradox of ROI" in the advertising industry. It begins by defining a paradox and providing examples. It then explains how during economic recessions, increased individual savings can paradoxically result in decreased overall savings. Finally, it introduces how the advertising industry faces a similar paradox - when advertising solutions deliver better returns on investment for advertisers, the advertisers may respond by decreasing their advertising spending. The document provides context on key terms and the advertising industry.