The concept of 'cities as economic engines' recognizes that urban areas drive significant portions of national economic activity through concentrated commerce, innovation, skilled workforces, and infrastructure. Canada's major cities generate disproportionate shares of GDP, tax revenue, and employment. This understanding has influenced federal policy, with successive governments acknowledging that investing in cities supports national prosperity. The argument supports direct federal-municipal relationships and infrastructure investments that might traditionally have been seen as purely local matters. However, this urban focus can create tensions with rural communities and provinces who see such attention as diminishing their importance.