Sumário:The economics of the “economic and financial equilibrium of the concession contract” (EFECC) -- The EFECC in the Brazilian law -- The EFECC in the Brazilian road concession contracts of 1995 and 2007: Concession award based on the least tariff of the Brazilian concession program and renegotiation. Role of the program for road exploration (PER). The EFECC in the 1995 contract. The EFECC in the 2007 contracts: Overview. The role of the rate of return on renegotiation. Risk allocation -- The EFECC in the 2009 and 2013/14 contracts. Are risks well allocated?.