“…Prior studies have shown that a firm's economic performance is variously affected by differences in market structures [ [7] , [8] , [9] ]. The strength of the competitor's threat depends on its market position [ [10] , [11] , [12] ]. While these studies have shown that differences in market conditions can affect firm performance, it is even more useful for firms with smaller sales to be able to estimate the strength of influence from competitors.…”