Another disadvantage of applying the bonus mechanism to the RES-H sector may lie in the perception of high levels of complexity. This at least is the experience gained from the stakeholder process when attempts were made to implement such a system in Germany. A RES-H bonus model is a rather new mechanism for the sector with few comparator examples anywhere in the world yet. As a result, a large amount of explaining is required to convince stakeholders (especially politicians and market actors) that such a new approach would have many advantages. Due to the large amount of transactions between those who are entitled to receive the support and those market actors that will pay for it, the model in Germany at least was perceived as being extremely complex and linked to high transaction costs.