Output (market, non-market, ancillary) of environmental protection services is defined in EPEA as the sum of environmental protection market output, environmental protection non-market output and environmental protection ancillary output. Market output is the output disposed of on the market or intended to be disposed of on the market. Non-market output is provided to other units for free, or at prices that are not economically significant. Ancillary output is intended for use for production activities within an enterprise. Environmental protection ancillary output called 'legally acceptable valuation' is measured as the sum of the components 'compensation of employees' and 'intermediate consumption' for the environmental protection ancillary activity.