“…Hence, we have the following These problems are well-known in the economic literature. 5 A huge amount of contributions have been devoted to them and to proposals for mitigating the IRR's awkwardness (e.g., Boulding, 1935, 1936b, Samuelson, 1946Lorie and Savage, 1955;Solomon, 1956;Hirshleifer, 1958;Pitchford and Hagger, 1958;Bailey, 1959;Karmel, 1959;Soper, 1959;Wright, 1959;Kaplan, 1965Kaplan, , 1967Jean, 1968;Arrow and Levhari, 1969;Adler, 1970;Ramsey, 1970;Norstrøm, 1971;Flemming and Wright, 1971;Aucamp and Eckardt, 1976;Bernhard, 1977Bernhard, , 1979Herbst, 1978;Ross, Spatt and Dybvig, 1980;Dorfman, 1981;Gronchi, 1986;Hajdasinski, 1986Hajdasinski, , 2004Promislow and Spring, 1996;Bernhard, 2003;Hazen, 2003Hazen, , 20096 Rocabert, Tarrío, Pérez, 2005;Kierulff, 2008;Simerská, 2008). 4 For example, the project with cash-flow vector ሺ−4,12, −9ሻ has a unique IRR equal to ݎ = 0.5, but the NPV is negative for any other rate.…”