This thesis consists of an introductory part and three papers. <p> Paper [I] examines how taxes affect consumption of commodities that are detrimental to health and the environment. Specifically, this paper examines if a tax increase leads to a significantly larger change in consumption than a...</p>

With policies to promote power generation from renewable energy sources (RES) becoming important part of climate and energy policy worldwide, there is now considerable interest in understanding how these different market-based mechanisms affect power generating firms in practice. The existing...