On the other hand, if support mechanisms are not readjusted in light of drops in production costs, the system can experience a sudden surge in investment, leading to increased costs to public budgets. In 2011 PV cost reductions thus generated overdeployment in countries which subsequently readjusted or cut their tariffs (e.g. United Kingdom, Spain, Germany), leading to increased uncertainty for investors. Frequent and prior consultations with the private sector as well as transparent decision-making and intelligent, adaptive FiT degression rates, are therefore crucial both to minimizing the costs of incentives on public budgets and to reducing policy uncertainty.