Considering the market values obtained by Index Mundi [19] for each component of televisions, computers and mobile phones, it is estimated that the net amount of WEEE in 2010 was just over $5 billion. This means in general that the WEEE generated annually in the world corresponds, in terms of wealth creation, about a deposit with a return of 0.71% of all oil reserves in Brazil added.
As suggested earlier the WEEE management can be perceived in a similar way to the management of exhaustible resources, because its components, as well as exhaustible natural resources, according to Zimmermann [20], "are not but become" having their stocks either expanding or contracting in response to the wishes and actions of men, and technological conditions, economic and political. "
The use of exhaustible resources options is related to intertemporal decisions, which imply a cost of use for
the present generation to compensate future generations. Such intertemporal decisions depend on the interest
rate (δ) and the NAV. The result of such decisions implies the magnitude of the negative externalities of stock
of WEEE for the planet. These negative external stock of WEEE occur as the constituents of the same have
their risk of oxidation degradation, leaching and high solubility as it remains stored and do not suffer
interference for recycling, for example see [21].
In order to simulate the relationship between stock of WEEE and its impact (environmental and economic) it
was considered an environment with stock of WEEE equal to zero and that, in the first year, this stock (S) is
equivalent to all WEEE produced in the same year, disregarding recycling or other forms of reducing the
WEEE, variable denoted by r. Thus, we have: