“…We measured a firm's technological niche width as the range of engine capacity (in horsepower) across all HEV models for any given year (Dobrev, Kim, & Carroll, ). This measure has been used in previous studies investigating the automobile industry (Argyres, Bigelow, & Nickerson, ; Dobrev, Kim, & Carroll, ; Dobrev, Kim, & Hannan, ). Specifically, we computed a firm i 's technological niche width at time point t using the formula below: where E max it and E min it indicate a firm i 's largest and smallest engine capacity in year t , respectively (Dobrev etal., ; Rhee, Kim, & Han, ).…”