We consider the Brazilian input-output tables for the years 2010 and 2015 and find a significant asymmetry in the roles that sectors play as input suppliers to others. We observe few sectors with many connections and many sectors with few connections, which means sectoral idiosyncratic shocks may lead to aggregate fluctuations. Generalized Pareto exponents decrease from one period to the other, which suggests the input-output network has become more vulnerable to shocks. We identify real estate as the most important sector and, given its high connectivity, shocks to it can become a major driver of the Brazilian business cycle.