Based on the attached file I need help with the following question:

What is the payback investment criterion? What are its benefits and deficiencies? Based on the payback, which project would be selected?

The Investment Detective The essence of capital budgeting and resource allocation is a search for good investments in which to place the firm's capital. The process can be simple when viewed in purely mechanical terms, but a number of subtle issues can obscure the best investment choices. The capital-budgeting analyst, therefore, is necessarily a detective who must winnow bad evidence from good. Much of the challenge is in knowing what quantitative analysis to generate in the first place. Suppose you are a new capital-budgeting analyst for a company considering investments in the eight projects listed in Exhibit 1. The chief financial officer of your company has asked you to rank the projects and recommend the "four best" that the company should accept. In this assignment, only the quantitative considerations are relevant. No other project characteristics are deciding factors in the selection, except that management has determined that projects 7 and 8 are mutually exclusive. All the projects require the same initial investment, $2 million. Moreover, all are believed to be of the same risk class. The firm's weighted average cost of capital has never been estimated. In the past, analysts have simply assumed that 10 percent was an appropriate discount rate (although certain officers of the company have recently asserted that the discount rate should be much higher)