“…Marketseeking variables consist of gross state product (LGSP), reflecting absolute market size (Buckley et al, 2007;Ramasamy et al, 2012;Huang & Wang, 2011;Bobonis & Shatz, 2007;Kolstad & Wiig, 2012;Cheng & Ma, 2007;Alon, 2010;Halvorsen, 2010;Head et al, 1995) and gross state product per capita (LGSPPC), reflecting spending power (OECD, 2012) (Kang & Jiang, 2012;Buckley et al, 2007;Ramasamy et al, 2012;Huang & Wang, 2011;Zhang & Daly, 2011;Duanmu, 2012;Cheng & Ma, 2007). Efficiency-seeking variables include the percentage of unionized employees in a given state (UNION) (Halvorsen, 2010;Friedman et al, 1992;Woodward, 1992;Coughlin et al, 1990;Bobonis & Shatz (2007); Head et al, 1999) and the highest marginal state corporate tax rate (TAX) (Fox, 1996;Woodward, 1992;Coughlin et al, 1990;Bobonis & Shatz, 2007;Head et al, 1999). The former proxies relative operating costs, including, for example, working conditions, and the latter reflects real tax rates paid to the state government over and above that given to the federal government.…”