Accuracy of Data in Foreign Markets May Be Suspect

Accuracy of data in foreign markets may be suspect. This is especially true if it neglects to record significant commercial and non-commercial activity. One example
Of data that is often not recorded (though it might be significant) is:

A) trade across national borders.
B) trade by mail.
C) smuggling activities.
D) trade carried by package shippers such as FedEx or UPS.
E) trade with foreign banks.