If life is a "zero sum game", then this does not explain how economic growth happens. Some will tell you that this is only because what we see is an illusion, and in calculating growth, we omit some of the costs, which is why there is a growing demand for economists to value things such as amenity, landscape and the like, and to take into account the costs of pollution, depletion of resources and similar "hidden" items.

However, be that as it may, according to I&PE, while some are suffering because of the uncertainties (and some of the certainties!) of the Brexit vote, others are looking around for the opportunities that a falling pound brings, exploiting the differential brought  to currencies by differing national economic performance and outlook. Dollar denominated funds are circling like vultures, it seems. Carrion eaters are all part of the "Circle of Life" as the Lion King has it....