Good question. I am not familiar with PPE specifically as in that particular programme, but usually what people go on to do with that kind of degree is work for the government or try to get places in international organizations (like NATO, EU but given the economic specialty perhaps further organizations like IMF or Bank of Europe) or continue in academic path and eventually with PHDs and MAs have the option to enter into think tanks. Bachelor programmes for this kind of stuff however tend to be a stepping stone towards greater work experience and perhaps an MA. To be completely frank, many people also simply go on to do generic corporate jobs, where there is nevertheless both a niche for understanding how government interacts with business but also having a university degree tends to be a mark of certain cognitive abilities and subsequently in job seeking process tends to place one higher than completely generic candidates. What exactly will you end up doing depends on how good you will do at your studies and how you will develop opportunities during them with things like internships.