Well, economists like to make the case for more emphasis on consumption taxation relative to income taxes, which can have incentive effects on work effort, savings and risk taking. (worthwhile.typepad.com)
There has been much less research specifically on teacher pensions, but that which is available indicates strong incentive effects. (educationnext.org)
Most economists think that a straightforward tax on carbon would have the same incentive effects for alternative fuels and conservation as cap - and - trade without the rigidities and uncertainties of emission limits. (carbontax.org)