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When the US stock exchange falters and foreigners begin to doubt the value of their dollar holdings , investors could " head for the exists " as they did in Asia , proving a fatal weakness of the deregulated global financial system . In measuring and reporting official foreign exchange reserves , some authorities have incorrectly included funds that have been lent to domestic banks , or the foreign branches of domestic banks . However , there are many points of contact between them and in recent years the exchange of ideas between these fields as intensified . While cross-border exchange has existed for well over a century , in recent years the accelarating currents of cultural and economic globalization have hastened the emergence of this transnational megalopolis . Although Mexico would be expected to contribute to these efforts in exchange for the benefits of participating in a NACM , it is likely that U.S. resources would be required to avoid placing excessive strain on the Mexican system .