"Banking and finance." . . "tulonsiirrot." . . "Poverty." . . . . . . . . . . . . . . . . . . . . . . . . . . "Optimal Non-linear Income Taxation for the Alleviation of Income Poverty" . . . . . "Optimal non-linear income taxation for the alleviation of income poverty"@en . "Optimal non-linear income taxation for the alleviation of income poverty" . . . . . . . . . . . . . "Optimal nonlinear income taxation for the alleviation of poverty" . "Optimal nonlinear income taxation for the alleviation of poverty"@en . . . . . . . . . . . . . . . . . . . . . . . . . . "Income tax." . . "Economics, economic history and consumer affairs." . . "tulovero." . . "Taxation." . .