Nov 30 (Reuters) - GoldGoldCOVID-19 vaccine and better U.S. political stability beneath Joe Biden's incoming administration sparked a sell-off within the metallic and favoured historically riskier belongings. * Vaccine optimism and bets for extra financial easing forward of testimony in Congress from U.S. Federal Reserve Chairman Jerome Powell this week, helped to push the greenback to a extra than two-year low and boosted world shares. * U.S. well being authorities will maintain an emergency assembly to advocate a coronavirus vaccine for healthcare professionals and individuals in long-term care services, whereas Britain is ready to approve BioNTech SE and Pfizer Inc's COVID-19 vaccine. * Though U.S. President Donald Trump pledged to proceed his authorized struggle to overturn the Nov. three election outcomes, his feedback in a Fox Information phone interview steered he was rising resigned to his Democratic opponent shifting into the White Home on Jan. 20. * Face-to-face negotiations between the UK and the European Union over a commerce deal restarted on Saturday, in a last-ditch try to seek out settlement with simply 5 weeks to go earlier than their present relationship ends. * Gold