Gross domestic product is healthy, even sustainable, having expanded uninterrupted over the last 12 years at an annual average rate of four percent. Not long ago the Australian dollar breached the psychological US80 barrier, having climbed from US48 at the height of the Asian crisis in the late 90s. But lately it's been seesawing in the low US70, mostly because the US dollar has regained some strength in world currency markets on the back of heartening numbers on US growth, especially jobs, however temporary. Meanwhile, it's good news for Australian exporters, and not so good for importers who, thanks to the boom in the domestic economy, have never seen their tills tick over so frenetically in a long time.