A further widening of Canada's goods-trade surplus to a four-year high isn't as good as it first looks, since exports in volume terms were essentially unchanged, says Capital Economics' Ariane Curtis. She believes the only positive is that the rise in import volumes for May suggests domestic demand is gradually improving. Curtis adds the trade data look to be consistent with the flash estimate of a modest 0.1% on-month rise in GDP for May. (robb.stewart@wsj.com; @RobbMStewart)