An article in the Wall Street Journal discussed the views of Canadian Minister of Finance Joe Oliver on the effect of falling oil prices on the Canadian economy. According to the​ article, Oliver argued that​ "lower oil prices would have a broadly neutral impact on real ... gross domestic​ product, but have a negative effect on nominal​ GDP." ​Source:​ Reuters, "Canada Pushes Back Budget to April Due to Market​ Instability," New York Times​, January​ 15, 2015. Oliver must be expecting the effect of lower oil prices to:________.