Of all the returns we estimate, perhaps inflation is the most difficult to forecast.
In reality, big oil profits are controlled by a long list of factors that are comically difficult to forecast.
These deals have been coming in so fast and furious, it is difficult to forecast how they will collectively affect earnings going forward.
Audit Scotland said a number of factors would affect prescribing and its associated spending in coming years, and it is difficult to forecast and quantify their long-term impact.
The direct impact on average revenue per user is difficult to forecast as it could be a mixed bag depending on how the adoption of new pricing pans out.
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However, it is more difficult to forecast beyond that.
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He added that Iraq-related concerns were rendering it "especially difficult" to forecast US economic performance.
That makes it difficult for us who try to forecast the markets as well.
But that is not reality, particularly given the debt-laden woes of the U.S. and European economies, which makes it difficult for businesses and individuals alike to forecast their financial futures.
Unless America can convince the IMF to go soft by accepting a rosier forecast, the Europeans may have to lend Greece more money (difficult), forgive some of its debt (almost impossible), or both.
Local and regional weather patterns are more difficult to predict, as anyone who has relied on a five-day weather forecast can understand.
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