Three measures in the Abbott government's budget have been described as ''crude'' and ''too harsh'' by public policy experts, with one measure in particular being ridiculed for having a ''bush economists' logic''.

The chief executive of the Grattan Institute, John Daley, said on Monday that the Abbott government's controversial $7 medical co-payment plan, its decision to introduce uncapped fees in the university sector, and its work for the dole scheme were bad policies that would not help to fix the structural budget deficit.

Ben Phillips, a research fellow from the National Centre for Social and Economic Modelling, said the severity of the budget overall was ''beyond common sense''.