Policy instruments on energy efficiency of refrigerators. The variable measures the presence of a policy instrument in 1970, 1980, 1990, and 2000.
Variable coding:
0 = 'No policy'
1 = 'Obligatory standard, prohibition or ban'
2 = 'Technological prescription'
3 = 'Tax or levy'
4 = 'Subsidy or tax reduction'
5 = 'Liability scheme(s)'
6 = 'Planning instrument'
7 = 'Public investment'
8 = 'Data collection / monitoring programme(s)'
9 = 'Information based instrument'
10 = 'Voluntary instrument'.
Type of variable: Categorical