The G20 finance ministers have agreed to work towards effective taxation of the super-rich following a meeting in Rio de Janeiro. “With full respect to tax sovereignty, we will seek to engage cooperatively to ensure that ultra-high-net-worth individuals are effectively taxed,” the ministers said in a final declaration. “Cooperation could involve exchanging best practices, encouraging debates around tax principles, and devising anti-avoidance mechanisms, including addressing potentially harmful tax practices,” the statement said. “The fight against hunger, poverty, inequality and the taxation o…