The Valle de Mexico should learn from the Dutch experience that without a system of laws and regulations for waste materials, and control measures established from the outset, all w'aste could end up in a landfill. If the authorities want to promote the participation of private waste-processing companies, it needs to give them the possibility of developing profitable activities. With mandatory and prohibitory provisions and taxes, a better grade of waste processing can be enforced. Table 4.5 presents a non-exhaustive overview of those policy instruments, which can be designed and implemented in different ways to influence their effectiveness. Those presented in Table 4.5 are options authorities in the Valle de Mexico might explore.