Because often make it possible for young firms to provide services that are equivalent or superior to an incumbent, a new entrant may be able to serve a market more effectively, with more personalized services and greater attention to product details.
A. Backward and forward integration
B. Digital technologies
C. Entry barriers
D. Strategic groups

B. Digital Technologies

Explanation:

Digital technologies are electronic tools, systems, devices and resources that generate, store and process data. Enterprises and firms tend to use these technologies in their business in order to create new value in business models, improve customer experiences and internal abilities that support its core operations.

Many young firms when competing with incumbent firms usually adopt these digital technologies quickly in order to make their products and services more attractive to customers by providing personalized services and greater attention to details that most of those incumbent firms that haven't adopted the technologies don't do.

answer; by looking at total product,marginal product,and changes in both after changes in inputs

answer; lags, push the econ below the natural level of output;