The cost of undervaluing (or underestimating) graduates' contributions in this area is becoming clear.
Proposition D improves on the earlier proposal by exempting workers who earn less than $50,000 from any increases in retirement contributions and sets a graduated contribution rate so that more highly paid employees will contribute to their retirement at a higher rate than lower paid employees.
3.40pm: Cable says that he is in favour of a progressive graduate contribution.
Browne's core proposal of a larger graduate contribution is controversial.
How can the Scottish claim that they have free higher education if everyone has to pay the graduate contribution?
Students will get loans to cover the costs, and they will repay through a progressive graduate contribution scheme.
Finally, the report recommends increasing "other sources of income" – this includes general support for some kind of graduate contribution.
Labour's shadow education secretary in Scotland, Claire Baker, says the party's previous graduate contribution was "a responsible choice".
His party has spent a decade rejecting all forms of graduate contribution as an article of faith.
3.39pm: Cable says that, if the graduate contribution is to rise, it should be linked to the graduate's ability to pay.
