Clearly productivity is related to a number of factors. The key ones are the quality of your workforce: the human resources skills they possess, the education they have, the amount of capital they have to work with--and that seems to be the main reason Canada is levelling off. Worker productivity per se didn't fall; workers had less capital to work with in this country, relative to the U.S. The U.S. invested a lot more, particularly in the ICT boom in the late 1990s and after 2000, and particularly a lot more in ICT equipment. Because investment is picking up in this country, you're starting to see productivity pick up in 2005; workers have more capital to work with in this country.
Frankly, with all the surveys we have of investment intentions and just looking at the projects you see in the oil sands and in building permits, there's every reason to think this investment boom will continue. That's probably the biggest part of the answer to boosting productivity in this country.