الكمية الفعّالة لإعادة التدوير -الجزء الأول

Greendale residents consider only their private marginal cost when disposing of waste, which is minimal due to low trash pickup fees. They ignore the social marginal cost, which includes negative externalities like environmental damage and landfill overuse. This gap between private and social costs leads households to choose the cheaper option of landfill disposal over recycling.

Private marginal cost represents only the household's direct disposal expenses, which rise slightly with more trash. Social marginal cost captures total societal costs, including environmental damage and landfill strain. The social marginal cost rises faster because it accounts for negative externalities that individual households don't bear directly.

Initially, when little recycling occurs, the marginal cost of recycling is low or zero. As recycling expands, costs rise due to collection, separation, and cleaning efforts. The increasing marginal cost reflects the growing expenses required to process larger volumes of recyclable materials efficiently.

The efficient amount of recycling occurs where the marginal cost of recycling intersects the social marginal cost. This intersection point balances the costs of recycling with the societal benefits gained by reducing landfill waste and associated negative externalities. At this point, society maximizes overall welfare.

Policies like disposal fees, recycling permits, and incentives can help internalize societal costs into household decisions. Increased disposal fees raise the private cost of landfill use, making recycling more attractive. However, implementing such policies is often challenging due to political and logistical barriers.

Households in Greendale only consider their private marginal cost, which is low, so they recycle less than is socially optimal. The negative externalities from landfills are not factored into individual decisions. This creates a gap between the privately chosen recycling level and the socially efficient amount.

Negative externalities from landfill waste cause the social marginal cost to exceed the private marginal cost. These externalities include environmental damage and resource depletion. The efficient recycling level accounts for these externalities by balancing recycling costs against the societal benefits of reducing waste-related harms.