David Solomon, chief executive of Goldman Sachs, said: "We do need some more fiscal stimulus to continue to bridge the gap, move through this tunnel and get to the other side - there is still a huge level of uncertainty."
The World Bank predicts that global GDP will contract by more than 5 per cent this year, with most countries falling into recession. Eurozone economies contracted at the end of last year and most countries are set for a double-dip recession.
Lagarde doubled down on her pledge that the ECB would "continue to support all sectors of the economy" and ensure that financing conditions - like bank lending and bond yields - are "favourable".
Last week she kept interest rates and quantitative easing on hold, but raised the prospect of more stimulus on top of the €1.8 trillion ($3t) announced as part of the Pandemic Emergency Purchase Programme that was extended in December.
As the economy begins to reopen there must be targeted investment - supported by governments - in "a new economy which will be associated with positive developments" from the pandemic, said the former International Monetary Fund chief.
Inequalities in international digital taxation must be reduced, argued Le Maire.
"The winners of the economic crisis are the digital giants. How can you explain to some sectors that have been severely hit ... that digital giants will not have to pay the same amount of taxes?" he said. "This is unfair and it is also inefficient from a financial point of view."
Le Maire said US Treasury Secretary Janet Yellen was open to the idea of an international digital taxation regime and that an agreement could be reached by the end of the year.
The comments came as the International Labour Organisation confirmed the massive impact of the pandemic on the global economy.
Its annual estimates showed 8.8 per cent of global working hours were lost for the whole of last year compared to the end of 2019 - the equivalent of 255m full-time jobs and four times bigger than the number lost during the global financial crisis.
The blow, which fell hardest on young workers and women, cost some US$3.7t ($5.1t) in lost income, the ILO said.
Its director-general Guy Ryder called for continued monetary stimulus, and targeted support for poorer countries in rolling out vaccines: "The signs of recovery we see are encouraging, but they are fragile and highly uncertain, and we must remember that no country or group can recover alone."
- Telegraph Media Group