Kauffman Foundation, SURGE, Blink, Global Entrepreneurship Network (Startup Genome), among others all offer individual rankings for the entrepreneurial ecosystems across various regions. Each includes a measure of the density of either high-growth companies or mature ones. The fact is both are important indicators that can also influence another metric — the quality and strength of the workforce.
Given that workers currently spend a median of 4.6 years at a given job (and for ages 25-34 only 3.2 years), in deciding to relocate for a specific opportunity, people often look at what their next jobs may may be within that market. A tipping point occurs for many growing ecosystems such as Chicago and Austin such that there are so many opportunities that attracting talent becomes easier and the population growth accelerates. These opportunities need not only be within startups but often include more mature businesses as well. The transference of work talent spills over in both directions and they catalyze each other.