"The stimulus from Europe is a positive thing, especially when you compare it to the fact that the US is starting to ease up," Joe Bell, senior equity analyst at Cincinnati-based Schaeffer's Investment Research, told Bloomberg News. "Stimulus is being added from a different market."
The European Central Bank cut its benchmark interest rate to 0.15 per cent, from 0.25 per cent. It also lowered the deposit rate by 10 basis points to minus 0.10 per cent, meaning the ECB is charging banks for depositing money with it. It is the first major central bank to take one of its main rates negative.
The ECB also opened a 400-billion-euro (US$542 billion) facility to encourage banks to lend more freely to businesses in the euro zone.
The measures also include "preparatory work related to outright purchases of asset-backed securities," ECB President Mario Draghi told reports in Frankfurt on Thursday.
"The key ECB interest rates will remain at present levels for an extended period of time in view of the current outlook for inflation," Draghi said. "This expectation is further underpinned by our decisions today. Moreover, if required, we will act swiftly with further monetary policy easing."
"The Governing Council is unanimous in its commitment to using also unconventional instruments within its mandate should it become necessary to further address risks of too prolonged a period of low inflation," according to Draghi.
Europe's Stoxx 600 Index ended the session with a 0.4 per cent gain from the previous close. Germany's DAX rose 0.2 per cent, while France's CAC 40 added 1.1 per cent. The UK's FTSE 100, however, slipped 0.1 per cent.
The DAX broke through the 10,000 point mark for the first time before easing.
The euro added 0.4 per cent against the US dollar. The respite for the single currency is already being viewed as temporary, encouraging bets that the ECB will need to be even more aggressive in the months ahead.
At least for today though, Europe's top policymakers are getting a positive response.
"The ECB is providing stimulus and that will help the global economy. It's a powerful force in keeping world interest rates low," Kathy Jones, fixed income strategist at Charles Schwab in New York, told Reuters. "Draghi delivered."