Cities attract people of different talents and skills. Its streets and buildings form competitive cauldrons where these differences are refined into specialization. Specializations combine into industries that produce a sum greater than the individual parts. Those sums are then sold elsewhere to create wealth. Cities, then, are the deep sea vent of economies: the place where elements collide to create new forms of life. That makes them vital for any national strategy of growth. In fact, such a strategy should piece together how the cities within a country’s borders can complement each other as they compete. Prague, today, has a challenge.