“…Because start-ups are usually located close to the founder's residence (Stam, 2007;Dahl and Sorenson, 2009) Sometimes, net entry, calculated as the change in the number of businessowners, is used, mainly for reasons of data availability (e.g., Carree and Thurik, 2008;Dejardin, 2011). Another variant is to analyze the effect of turbulence, defined as the number of entries plus the number of exits, on economic development (e.g., Bosma, Stam, and Schutjens, 2011), which can be regarded as an indicator of the level of creative destruction in the region. Most studies based on data from the Global Entrepreneurship Monitor (GEM) (e.g., Bosma, 2011) use "total entrepreneurial activity" (TEA), which is the percentage of population between 18-64 years old that is either actively involved in starting a new venture or is the owner/manager of a young business (for details, see Reynolds et al, 2005).…”