In france, fine dressmaking and tailoring have been a tradition predating queen marie antoinette. cloth manufacturers, design schools, craft apprenticeship programs, modeling agencies, and so forth, all exist to supply the clothing industry. this is an example of the in porter’s model.
a. strategy, structure and rivalry among firms
b. related and supporting industries
c. demand conditions
d. factors of production

B) related and supporting industries

Explanation:

Related and supporting industries refer to the whole dimension of an industry within an economy.

We can use a much more domestic example for this, Miami and vacation industry. The vacation industry is not just the hospitality industry (hotels, etc.), it includes a lot more: resort developers, shopping centers, homeowners' associations, community colleges and universities, retail associations, etc. When an industry is so dominant on a certain location, several supporting industries are needed. For example, chefs need to be trained somewhere, cars have to be rented, retail stores must get organized (e.g. Espanola Way and Lincoln Road in Miami Beach), pool cleaning companies are needed, etc. The vacation industry employs hundreds of thousands of people in southern Florida.

answer; is the sum of all individual demands curves;