In general, I think linking productivity growth to immigration is a stretch because it depends on what immigrants will do. That requires investment and other factors that will boost productivity.
Productivity is a complicated issue that is very hard to track and understand. If you look at what different governments have done over the past 20 to 25 years, many things that are considered to be the right things to do to boost productivity have been done. Unfortunately, except for the last few quarters when we have seen a boost in productivity, we haven't seen the results of those policy measures. We have seen tax cuts, investment in innovation, those kinds of things, but we haven't seen the result. In one sense it's a puzzle for policy-makers in terms of how to deal with it.