Answer: Market commonality
Explanation: Market commonality can be explained as the number of market a company and its competitors are jointly involved in. Market could mean segment or division of certain goods and services. Market in this context could mean finance, automobile, telecom and so on. It also measures the importance placed on each of these markets. Market commonality can be measured in terms of products and services offered by competing companies and shared customer base. Market rivalry could be used to evaluate the degree of rivalry as greater market commonality tends to yield increased rivalry.