The dollar fell against a variety of currencies in volatile European trading last Thursday as jumpy investors did an about-turn and sold the dollar. Their faith was somewhat restored in the ability of euro-zone leaders to resolve the region’s debt crisis at a pivotal weekend summit, in spite of an absence of news.

Traders invested in the euro, which had sagged against the dollar in Asian and early European trade, as news resurfaced affirming the basic principles of the euro zone’s July 21 arrangement that the European Financial Stability Facility might be in a position to buy sovereign debt directly from nations issuing new bonds or on the open market.

The dollar also fell against the Australian, New Zealand and Canadian dollars, as investors were prompted to place relatively risky currency bets back on, when European shares narrowed their losses.

The ICE Dollar Index, which tracks the greenback against a trade-weighted basket of currencies, was at 76.822 in comparison with 77.085 late Wednesday in New York.