Abhisit Vejjajiva has a reputation for clean politics
Thailand's King Bhumibol Adulyadej has given his endorsement for Democrat Party leader Abhisit Vejjajiva to become prime minister.
Thai television showed footage of the king signing the notice of appointment.
The step formalises Mr Abhisit's ascent to power after 16 years in politics, making him the country's third leader in as many months.
He has promised to tackle economic woes deepened by a political crisis which has starkly divided Thai society.
Speaking in a TV address after his endorsement as prime minister, Mr Abhisit issued a call for national unity and pledged to fix the country's "failed politics".
Earlier he said he would unveil an economic stimulus package in January.
Abhisit Vejjajiva makes a televised address
Amid continuing negotiations over the shape of his new cabinet, Mr Abhisit promised to "choose competent people to implement policies that are crucial to revive our country".
And he added that he would not allow anti-government protests which recently shut down Bangkok's domestic and international air terminals - stranding hundreds of thousands of passengers and striking a blow to the economy - to happen again.
Born in Britain, educated at Eton and Oxford
Entered parliament in 1992 as one of its youngest members
Party leader since 2005
Opposed military coup that overthrew Thaksin Shinawatra
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