Effectiveness

An Effectiveness score of 1 to 3 was assigned as follows:

  • 1 if the instrument was likely to produce 10% or less conditional reduction in carbon. This assignment was given to instruments that rely primarily on consumer information to drive behavioural change.
  • 2 if the instrument was likely to produce 20-40% conditional reduction in carbon. This assignment was given to instruments that rely primarily on price signals and voluntary trade sector programes to drive behavioural change.
  • 3 if the instrument was likely to produce more than 40% conditional reduction in carbon. This assignment was given to instruments that rely primarily on regulation and infrastructure to drive behavioural change.

Potential impact

  • Low (red): the instrument was likely to yield a less than 10% reduction in carbon associated with demand for the product/service category due to its effectiveness and scope
  • Medium (yellow): between 10 and 30% reduction
  • High (green): more than 30% reduction.

An initial judgment was formed of the potential level of success of the instrument in reducing consumer demand for high carbon goods and services and the embodied carbon and usage emissions.
The judgments were categorical rather than fully quantitative.
The judgments here were therefore LOW (the instrument is likely to yield a less than 10% reduction in carbon associated with demand for the product/service category due to its effectivness and scope); MEDIUM (between 10 and 30% reduction) and HIGH (>30% reduction).

The scoring system was as follows. An instrument/sector combination was first assessed for Scope.
Depending on the percentage of the carbon associated with a product in a particular sector, a Scope score was assigned between 1 and 3:

  • A Scope score of 1 if scope was 20% or less of the carbon of that product in that sector
  • A Scope score of 2 if scope was 20-40% of the carbon of that product in that sector
  • A Scope score of 3 if the scope was >40% of the carbon of that product in that sector

The instrument/sector was then assessed as to conditional effectiveness (i.e. effectiveness at reducing carbon associated solely with that product in that sector). An Effectiveness score of 1 to 3 was again assigned:

  • An Effectiveness score of 1 if the instrument was likely to produce 10% or less conditional reduction in carbon. This assignment was given to instruments that rely primarily on consumer information to drive behavioural change
  • An Effectiveness score of 2 if the instrument was likely to produce 20-40% conditional reduction in carbon. This assignment was given to instruments that rely primarily on price signals and voluntary trade sector programes to drive behavioural change
  • An Effectiveness score of 3 if the instrument was likely to produce >40% conditional reduction in carbon. This assignment was given to instruments that rely primarily on reguation and infrastructure change to drive behavioural change.