On the campaign trail, Thailand's new prime minister promised to kick-start the pandemic-hit economy, bolster household incomes, support small businesses and bridge gnawing inequality in the country of 71 million people.

Now, after three months of post-election paralysis, Srettha Thavisin has to walk the talk — swiftly.

The real estate tycoon won parliamentary support on Tuesday to take the reins of Southeast Asia's second largest economy at the head of an unlikely coalition.