South African President lashed out at "vaccine nationalism," accusing rich countries of bulk-buying coronavirus vaccines and hoarding them to the detriment of others.
I hope that with the new American administration we can now continue and intensify the work of the OECD on the minimum taxation of digital companies.
She added that she hoped "that we will succeed in once again anchoring the central role of competition law globally and preventing the emergence of monopolies."
Lagarde said the ECB's forecasts "remain valid" for now, as they took into account lockdowns persisting through the first quarter coupled with a gradual start to vaccinations.
Germany has taken increasingly tight measures, such as closing some schools and shops.
If infections failed to ease significantly and current restrictions on economic activity were to persist or even be tightened, there could be a sizeable setback.
US president-elect Joe Biden outlined a $1.9 trillion stimulus package proposal on Thursday, but failed to excite markets that had rallied in anticipation of the announcement.
"We need to restrict contact more strictly... We ask all citizens to restrict contact to the absolute minimum," she told journalists following a meeting with the leaders of Germany's 16 federal states.
Even if a first test was negative, travellers from risk regions would in future have to enter quarantine for five days and take a second test, Merkel said.