I have been thinking about this a lot. Here in the United States, we have "tier" cities:
Tier 1: "The Four Corners" (New York, Los Angeles, Chicago, and Houston) plus San Francisco, Boston, and DC.
Tier 2: Philadelphia, Phoenix, Dallas, Seattle, Charlotte, Nashville, Atlanta, and Miami
Tier 3: Austin, San Diego, Portland, Asheville, Louisville, Fort Worth, Milwaukee, Minneapolis, Burlington, and Cleveland
Tier 4: Cincinnati, Lexington, Albuquerque, San Antonio, Jacksonville, Columbus, Tulsa, Oklahoma City, Kansas City, Omaha, Syracuse, Buffalo, and Pittsburg.
Tier 5: St. Louis, Baltimore, Detroit, Memphis, Las Vegas, Little Rock, Jackson, and New Orleans