Mild effect of European Central Bank President Mario Draghi on global financial markets. When the Draghi Effect takes place, yields on bonds of embattled European countries pull back from historic high levels, cut down cost of borrowing, and denote there is buyer demand for their sovereign bonds. The euro can also increase while risk appetite returns and equity markets surge. In essence, the Draghi effect makes the European sovereign debt crisis appear less gloomy and the global macroeconomic more optimistic.