Air cargo, commonly known as air freight, is collected by firms from shippers and delivered to customers. Aircraft were first used for carrying mail as cargo in 1911. Eventually manufacturers started designing aircraft for other types of freight as well.
Economics and marketing. The consumer is the one who pays something to consume goods and services produced. As such, consumers play a vital role in the economic system of a nation. Without consumer demand, producers would lack one of the key motivations to produce: to sell to consumers. The consumer also forms part of the chain of distribution.
Quick Answer. Primary consumers are animals that eat producers, and since producers are almost always green plants, primary consumers can most simply be defined as herbivores, such as cows and deer. Consumer and producer, in this usage, refer to the production and consumption of energy in a form that can be used for life processes.