They Improve Price Signals的意思|示意

这些改善价格信号 In contrast to regulatory or administrative approaches, market-based instruments such as taxes and tradable permit schemes offer several advantages as a means of achieving environmental objectives. Whether by influencing prices (through taxation or fiscal incentives) or setting absolute quantities (via tradable permits), they improve price signals, allow industry greater flexibility in meeting objectives, and give firms a longer-term incentive to pursue technological innovations that further reduce adverse impacts on the environment.