A third option, known as a safety valve, is a hybrid of the price and quantity instruments.9L0-402 The system is essentially an emission cap and tradeable permit system but the maximum (or minimum) permit price is capped. Emitters have the choice of either obtaining permits in the marketplace or purchasing them 9L0-509 Exam from the government at a specified trigger price (which could be adjusted over time). The system is sometimes recommended as a way of overcoming the fundamental disadvantages of both systems by giving governments the flexibility to adjust the system as new information comes to light.9L0-509 It can be shown that by setting the trigger price high enough, or the number of permits low enough, the safety valve can be used to mimic either a pure quantity or pure price mechanism.
All three methods are being used as policy instruments to control greenhouse gas emissions: the EU-ETS is a quantity system using the cap and trading system to meet targets set by National 9L0-402 Braindump Allocation Plans, the UK's Climate Change Levy is a price system using a direct carbon tax, while China uses the CO2 market price for funding
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