This can hold equally for the individual consumer or for an energy-using enterprise. The surplus of disposable income can be spent in different ways and, depending which option is chosen, can have significant impacts on individual, company, sectoral, and economy-wide energy consumption. Similarly, a number of drivers are important in determining enterprises' investment decisions such as their financial situation, knowledge of energy efficiency potential, commitment to the environment and energy efficiency, public and market demands, and policy obligations (IEA, 2011d).