 Economic factors, of course, are very important and we have had just in the last 50 years a number of wars associated with oil in particular, but also other fossil fuels. And also, as each of these is occurring, there will be associated fluctuations in the costs of a barrel of crude. So fluctuations in oil price. And of course, you can track these fluctuations on a daily basis just by looking at different markets. That also has an impact on us as individuals. So as an individual, we would have issues around the cost of petrol. That's going to affect us. Also the cost of things like electricity and where that's generated. They are also important economic factors, but they're more of an individual impact rather than more of a global impact.