I have never seen any research that tries to give a complete answer to that complex question. There will be a lot of challenges in estimating the opportunity cost of aid financing for instance. So, how do we assess this? Of course, there are many areas in which one can reasonably argue that positive impact is likely to exist. In areas of poverty reduction and investments to meet different types of global challenges for instance. We are currently talking about vaccines and pandemics. We talk about the climate and so on. In all of these areas development aid can help not only people in partner countries, but also us as donors in the long run.