In addition, removing other tax reliefs - such as reduced taxation of capital gains from the sale of a principal or secondary residence, stock options and carried interest - would increase equity and allow a growth-enhancing cut in marginal labour income tax rates. It would also reduce tax avoidance instruments for top-income earners. Examples include facilitating the accumulation of human capital, making educational potential less dependent on personal and social circumstances, reducing labour market dualism or promoting the integration of immigrants and fostering female labour market participation. Concerning taxation, reducing tax expenditures, for instance for investing in housing, contributes to equity objectives while also allowing a growth-friendly cut in marginal tax rates. For instance, administrative extensions of collective wage agreements may reduce wage earnings dispersion among workers, but if they set labour costs at too-high levels for some employers they may harm competition and productivity and possibly reduce employment.