Unfortunately, many women become pregnant while they are already addicted to drugs. This may happen with a number of drugs, however opiates are one area of extreme concern. Opiate use during pregnancy can result in low birth weight, premature birth, low blood sugar, and infant death.
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The gravity model of trade in international economics, similar to other gravity models in social science, predicts bilateral trade flows based on the economic sizes (often using GDP measurements) and distance between two units.The model was first used by Jan Tinbergen in 1962.he model has been an empirical success in that it accurately predicts trade flows between countries for many goods and services, but for a long time some scholars believed that there was no theoretical justification for the gravity equation.