European shares edge up on bid activity, energy stocks
* Stocks edge up in volatile trade after Monday's fall
* USG People surges after Japanese takeover offer
* Finland's Innofactor also rises on merger plan
* Oil prices show signs of stabilising, Spain rebounds (Updates prices, adds details)
By Sudip Kar-Gupta and Danilo Masoni
LONDON/MILAN, Dec 22 (Reuters) - Firmer energy stocks and takeover activity helped European shares to edge higher on Tuesday, recovering some ground following a retreat in the previous session prompted by worries over political stalemate in Spain.
Trading was volatile as the holiday season approached and some investors remained cautious over prospects for next year.
The pan-European FTSEurofirst 300 index, which had fallen 1.2 percent on Monday, edged up 0.15 percent by 1537 GMT, while the euro zone's blue-chip Euro STOXX 50 index was up 0.3 percent.
"There are no easy gains to make," said Marco Vailati, head of research and investment at Italy's Cassa Lombarda. Continuación...