It is doubtful whether pension contributions could really rise this much, particularly at a time when the increasing mobility of both labour and capital is reducing national governments' room for manoeuvre in taxation. The effort to achieve a more sustainable base for our pension systems has in recent years been a key plank of economic policy throughout the developed world.
The sustainability of pension systems can, of course, also be improved by postponing retirement. This, would increase the number of people paying in and reduce the number of people receiving benefits. Postponing retirement would slow the growth in pension expenditure, increase the supply of labour, improve the return on investments and accelerate economic growth.