But after four years, the recovery has become a puzzling economic phenomenon in its own right.

Economic history is the study of economies or economic phenomena in the past.

This is a demographic trend of an aging population, not an economic phenomenon.

World War I is not treated as a political or economic phenomenon.

Instead, today's rising labor costs seem to reflect a different economic phenomenon: growing income inequality.

But, on second thought, it is probably true that both are reflections of the same economic phenomena.

Some are beginning to label the European economic phenomenon a "growth recession."

But the change taking place is far more than an economic phenomenon.

But these of course, in these circumstances, are economic phenomena.

We have all insisted on demonstrating the importance of tourism as a social, economic and cultural phenomenon.