Talk about good timing. With Germany assuming the rotating presidencies of the European Union and the Group of Eight (G8) developed nations the country is enjoying an economic resurgence. It remains a formidable exporter of goods worldwide its unemployment rate has eased and a recent major tax increase has not dampened economic activity as much as many had feared. Still there is some question whether the recovery is sustainable and whether Germany is up to meeting such long-term challenges as an aging population and a declining birth rate according to faculty members at Wharton and German business schools as well as other experts.