Brain damage is not just a biochemical effect or physiological change, as the brain is crucial for who we are and what we can achieve. Economists argue that cost estimates are necessary to prioritize allocation of public spending. Thus, intelligence can be expressed in terms of life-time earnings that increase at higher intelligence quotients. Costs in terms of health care, special education, delinquency, and other problems can be expressed in terms of dollars. For the few chemicals with detailed information available, calculations suggest that brain drain costs us billions of dollars per year. These costs do not include the suffering of exposed children and their families.
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