Often, industries have either a greater proportion of firms that pursue a differentiation strategy or a greater proportion of firms that pursue a cost leadership strategy. For instance, a majority of firms operating in the private aviation industry (firms providing jet services for wealthy individuals) pursue a differentiation strategy, whereas a majority of firms operating in the checking account industry (financial services firms providing checking account services for customers) often pursue a cost leadership industry. Which industry has a similar proportion of firms that pursue a cost leadership and differentiation strategy