For the value of 𝛼 𝐿 we propose using the economic cost of plastic pollution, estimated to be between $3300 and $33000 per metric ton of marine plastic per year (2011 $USD). This term underestimates the total cost of plastic pollution, as it only considers the toll on marine ecosystems, not the complete biosphere. To acknowledge that not every item leaks into the environment, we adjusted 𝐶 𝑃 by multiplying by the total fraction of plastic leaking into the environment (𝜒 𝑃 ) and by the fraction with which a given type of item would contribute to the total amount of leaked plastic (𝑓 𝑃 ). Presently, society, not the manufacturer, bears the cost of plastic pollution, requiring discussions of policies for extended producer responsibility to acknowledge this cost.