This study, carried out by researchers from the Climate Policy Initiative/Pontifical Catholic University of Rio de Janeiro (CPI/PUC-Rio), analyzes the impact of the Manaus Free Trade Zone (ZFM) on Brazilian industry, especifically productive efficiency and energy efficiency. The researchers note that the efficiency levels of the ZFM and Brazil are similar, that is, despite the high volume of tax breaks granted to the ZFM industries, there is no counterpart in terms of efficiency.