This makes it difficult to assess the risk in these investments and to understand the correlation with the investment outcomes of other sectors (i.e. whether infrastructure assets move in line with other asset classes, such as equity markets, or not). Recent developments in accounting, in particular the introduction of fair value principles, have brought greater transparency and consistency to financial statements. However, the move towards fair value has also brought a greater focus on short-term market fluctuations, and some would argue that this has been to the detriment of the long-term investment horizon.