If business is now a global affair, then the export-import business is important, lucrative and necessary. An export-import agent is not a broker --- the agents are lower on the business totem pole.
Most properties are measured using a number and a unit of measurement. The unit of measurement is a standard amount. The number compares the property to that standard amount. This means a tree that is ten times as tall as a meter stick is 10 meters tall.
A measure, in music, is a measurement of time that contains a specific number of pulses defined by a time signature. Depending on the time value, a pulse, or a group of pulses, make-up a beat. A measure contains a natural division of strong beats and weak beats. Depending on the time signature, certain beats within a measure are naturally accented.