“Strength” might be a slightly too strong term to use for the world economy but it is certainly applicable for what we’ve become accustomed to over the past decade. There are very few places in the world that are not experiencing at least decent economic growth and this has led to continued advances in the stock markets of the entire world. This is apparently the “Goldilocks” economy (i.e. Not too hot, not too cold. Just right) that economist yearn for, and the stock markets like it too. We still have nothing but Green Arrows.
