Climate change must deal with two market failures: global warming and learning by doing in renewable use. The first-best policy consists of an aggressive renewables subsidy in the near term and a gradually rising and falling carbon tax. Given that global carbon taxes remain elusive, policy...

We examine the interaction between vote-share contracts and learning-by-doing. Candidates for a political office are allowed to offer vote-share thresholds. The elected politician has to achieve at least this threshold value in his reelection result to remain in office for a second term. We...