Natural See too: Ecotax, Gas Guzzler Tax, Polluter pays standard, and Pigovian charge This incorporates normal assets utilization charge, ozone harming substance charge (Carbon charge), "sulfuric duty", and others. The expressed object is to decrease the ecological effect by repricing. Financial analysts portray natural effects as regrettable externalities. As soon as 1920, Arthur Pigou recommended an assessment to manage externalities (see likewise the segment on Increased financial government assistance beneath). The legitimate execution of ecological expenses has been the subject of an enduring discussion