The best metric that a firm should use to determine which channel provides the best customers for their firm is:

its kinda hard to answer this when we dont have all the information that we need.

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

the definition of a small business is an independently owned and operated company that is limited in size and in revenue depending on the industry. a local bakery that employs 10 people is an example of a small business. a manufacturing facility that employees less than 500 people is an example of a small business.