Over the past week, investors have experienced a huge amount of anxiety over the state of the European economy. With bond rates in Spain and Italy soaring, many feared that the next dominos in the long sovereign-debt saga might be about to fall. But today, the head of the European Central Bank reassured investors that it was committed to prevent that from happening, saying that "the ECB is ready to do whatever it takes to preserve the euro" as long as it's within its mandate to act. The stock market liked that sentiment, sending the Dow Jones Industrials (INDEX: ^DJI) up more than 195 points just before 10:45 a.m. EDT.

All 30 stocks rose, with several stocks gaining between 2% and 3% on the day. Merck (NYSE: MRK) soared about 2.1% after publishing a study that showed some interesting results from drugs attempting to pinpoint and eliminate pockets of hidden HIV virus in patients. With billions in spending on HIV treatment, Merck believes the study could be the first step toward an actual cure for the disease.

American Express (NYSE: AXP) also jumped almost 2%. Between its travel-related services and its focus on higher-end card customers, AmEx arguably stands to benefit more than its peers from improvement in the European economy. With its recent efforts to boost its prospects from both established and new business lines, AmEx stands a good chance at continuing to outperform despite a somewhat disappointing earnings report last week.

Finally, Disney (NYSE: DIS) rose almost 2.5%. It undoubtedly stands to benefit from a stronger economy in Europe, but even more important was the news that came from Netflix's (Nasdaq: NFLX) earnings report. With Netflix's woes tied to the threat of increasing content costs, the value of Disney's library of timeless classics and new blockbusters seems to be going up and up, boding well for Disney shareholders.

Euro gonna love it
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