Nephew introduces sanctions as a strategic tool in U.S. foreign policy and explains them as an art whose efficacy depends on decision makers' creativity and their manipulation of using the economic, social and political tools as the sanction's tools. Nephew illustrates that export of many usual goods to the target country are prohibited during the sanction regime; the exporting of luxury goods can destroy the social's sense.[clarification needed] For example, the rise in chicken prices in Iran, a good that has not sanctioned, increased the pressure of sanctions among Iranian or exporting some goods to Iran evacuated the Iran's foreign currency reserves.[clarification needed][1][2][3]