Answer:
Competitive inertia
Step-by-step explanation:
Competitive inertia -
It is the activity method which a firm use due to the changes in the areas like the scope of market , new product , advertising , pricing , is known as the competitive inertia .
Hence , same case is shown in the question , when the Ziff Corp. did not change its strategy , as they where sure that their recent strategy is capable to make them the market leader .