An important part of a cost-benefit analysis is identifying
social customs.
economic consequences.
economic forecasts.
social reforms.

The cost-benefit analysis (CBA) is an systematic approach to calculating and comparing benefits and costs of a decision, policy (with particular regard to government policy) or (in general) project.
An important part of a cost-benefit analysis is identifying economic consequences. The most convenient common unit  with which the positive and negative aspect of the project are expressed is money. So, the consequences from the project are expressed in money gain or money loss.

That is true! many fish species traveled to the u.s. because of it.