I'll also give some examples of the kinds of factors that have been relevant of late. How do we know if there is a special factor at play? One source of information is our liaison teams across the country. They meet with all sorts of organisations and groups to better understand these special factors and trends.
The first is sustainable U.S. economic strength. The second is uncertainty on the timing and pace of U.S. monetary policy normalization. Third, lower oil prices appear to be here to stay for a while, and prices could even fall further before the trend reverses. On the domestic side, three issues are also predominant.