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Brokerage was introduced to increase transparency and liquidity of the ECO market by allowing a range of Green Deal providers, including new SME entrants, to trade with energy companies, thus helping keep cost to bill payers down. In keeping with this aim for transparency, a criterion used when designing brokerage was that it should allow for the trading of those commodities which are relevant to the legal targets set on the obligated energy companies. In the case of the carbon saving element of ECO, that obligation is expressed in carbon tonnes. Hard to treat cavity wall insulation and solid wall insulation are not identified as separate sub-targets. Aligning commodities with the relevant obligation also gives GDPs flexibility in preparing packages of future measures for auction.